Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb865d3672d87cb…

MALICIOUS

PDF

76.6 KB Created: 2021-06-11 08:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 39ff867cea8a6f4532a4a8e6b63018fe SHA-1: cee4743624246bcbc60cd4dee86a7d3e8d4941fa SHA-256: 1cb865d3672d87cbc444ff28a0e2d1fcf3bc42c3796384994c0e8e8e3216c1ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=multiplayer+android+games+offline PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491168/normal_5fccc35a36b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_604b905706f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_604738b3d607f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc5eb82c368c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482882/normal_60aff9dfbf9c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5ff82e0a4df66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5ffd182fd8ef3.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
    • http://fevosezew.pbworks.com/f/69754205076.pdfIn PDF document text
    • http://topanekegeza.pbworks.com/w/file/fetch/145047048/15329449499.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/97288871696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6370c77b-86f6-484c-bf7d-dfb3211c31d9/garmin_gpsmap_64sc_review.pdfIn PDF document text
    • http://gopidam.pbworks.com/w/file/fetch/144811938/blockman_go_editor_apk_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253e0611-e4e3-494c-9d5f-5109e6c9ffdc/99789947895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd02eac-207a-45cb-828d-56bad32464b1/diy_dungeons_and_dragons_dice_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47918d6-8692-4eb9-9dd0-0b130f882976/the_song_of_wandering_aengus_answers_key_readworks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c3f1f5-0b9c-4011-854d-69fa552a9c01/after_we_fell_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93bfaf8-0a05-4c55-921d-6404f7f1f535/neverending_story_dog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ed6e48-a412-4aa7-b144-243e7ea66cc9/vinuzawimawok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622303a0-c571-47fa-a63a-9d2c1afb2a0b/14459888245.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 5348 bytes
SHA-256: f1838df3a872bd9c4f3ac9ecf7febaec4861a70d802148e6526ac3deeef23d02
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10432 bytes
SHA-256: 91ed96b08b10a1786794b1cd01f77ce809309d1c81ac73e39b7e0d4283b58774
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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