Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e497795bcab372e…

MALICIOUS

PDF

83.0 KB Created: 2021-04-16 01:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7a5259900eaf8adf1b2d6bfbf922c720 SHA-1: b169c6fe829df2c1e984877c1430b3bf75107d18 SHA-256: 3e497795bcab372e8415c530a8763123c8dc74c086577642a4d69c0b6e9deb81
186 Risk Score

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 0.9990

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=book+outline+template+google+docs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fdecbe83fa66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_6022b25ba839a.pdfIn PDF document text
    • http://getsalle.xyz/indesign_label_templates_avery_5160dgsgm.pdfIn PDF document text
    • http://tamakar.tech/preghiera_coroncina_della_divina_misericordiacb2l0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fd9f43a49aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_6064184be60ef.pdfIn PDF document text
    • http://shop-profildoors.ru/are_nascar_cards_worth_anything1v8hz.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/72436954879uvtr4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ce6e90-67c0-40b8-8d77-44db73daebfa/reruduketafujituzefari.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_6c4363379c234b2faf9c9ebc15aceb0b.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_23eba4727d49434e9864812152093b31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6e8cad-d619-464f-8f6e-4009b1444fa9/ar_15_rifle_cleaning_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd283f97-c375-4c86-9802-280537de0520/graco_contender_65_car_seat_expiration.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_67a9095ed8be4b4e86ac5e6682cbb791.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e438e62-100f-49b1-bf5c-8bd8f62d0215/bell_f20_bike_computer.pdfIn PDF document text
    • http://womirejosowasu.epizy.com/cute_calendar_2020_printable.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_e5de85325ac54b35b6e2ddda3daca795.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_63fa3373a6dd402384a4c20606a75061.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ecac7c-7294-4e07-9ab8-28a44e2aa4cb/strength_training_exercises_without_weights_for_beginners.pdfIn PDF document text
    • http://naditoliwinudev.epizy.com/34179931886.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_964773bb0ae14d20a2f308b4117af2a7.pdf?index=trueIn PDF document text
    • http://tininababa.rf.gd/supplementary_congruent_angles_worksheet.pdfIn PDF document text
    • http://fipomazuwasa.epizy.com/xenofonte_anabase.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_6b00e1f340964461bded81a1ed3863e4.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_b1931cc6e752407d9a818b00ce2b3191.pdf?index=trueIn 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_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 5408 bytes
SHA-256: 0114a9faf64b3512bc362a3ca7d36da7b59612578a96fbfdb56540060ff6d34b
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 11620 bytes
SHA-256: 68e1ea77711348f08eb33221cdfb7765474a8cd1a45c730675603da254dcf843