Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9802396ebe1170…

MALICIOUS

PDF

143.7 KB Created: 2021-03-30 06:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8444bccf522fc88dcb8d2001a67e0ea9 SHA-1: 2ee3fe36e280c5576e86ec9b3766424b34186aef SHA-256: 6a9802396ebe1170c0d744981bb1e102599bc920a59e6edcc9401c7c7f0fb25a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/award?keyword=security+system+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368972/normal_603836b7d4791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465905/normal_6057d243d0184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_60464929967f0.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/xugutu.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/kabinopufo-rugas.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/interior_design_trends_2021_usa.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/larva_anopheles.pdfIn PDF document text
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/zodozotodu.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/levipufasujapedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_6060a03521383.pdfIn PDF document text
    • https://sozusodugalonus.weebly.com/uploads/1/3/4/6/134614171/repar-daneviwebadukom-boxowilarubive-josidixonav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_600901e9eb873.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/south_carolina_permit_test_book.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/winubijizamunadumum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_66fbad370354494aa44a4e9c3a82da08.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_e4a2f7b9a74149449a9bd29c23b1e998.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f090b65-b373-492f-b325-4a636fad4643/the_importance_of_being_earnest_summary_shmoop.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_ffa248482f7b4bdfb6f35502406911a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88391a91-1103-4386-9868-cca297a53744/how_to_replace_a_battery_in_a_plantronics_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d87b00-709e-4ab5-9bf1-a397368e00e8/plantronics_backbeat_fit_3100_case_not_charging.pdfIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_b11372820438400d960505a70c1a0a38.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_841657198b60469eb331e525d8480af9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2331728-94c3-4ef5-b854-e4dffe45da62/17040295084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ad81e1-5a0c-4729-a086-2dcce4d7bafa/50745985149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f4b631-2451-4420-a286-4b97292db716/13867439570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bddf25a-c79c-4d0c-a657-3caafeff1a2a/why_is_my_washing_machine_smelling_musty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f23769-4719-4dae-8022-31090bcb60ba/how_to_put_whirlpool_dishwasher_in_test_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917efe28-f4c1-4fee-bb60-6392875570b9/1659485352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16018a75-7308-4ef3-b9d4-05ad5e83c0fe/anet_a8_plus_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD13 5144 bytes
SHA-256: 1f8ee43278c5fe21ad0c6b1cc12d1c0ece25911abe865348dc4d770cedc6d27d
font_01_sfnt_off0001de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE80 14020 bytes
SHA-256: dd6037d0f6c56a979182b623c2272fa41832cd5ee5f8c21278f7355b2e61bcba
font_02_sfnt_off00020d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D5A 16088 bytes
SHA-256: ccd0ea095085b9379100d4de0d13d045157d8501f46cd3db2ef5c00475687e02
font_03_sfnt_off00022212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22212 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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