Malicious PDF — malware analysis report

Static analysis result for SHA-256 3771fe763f9af000…

MALICIOUS

PDF

93.0 KB Created: 2021-04-29 19:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2af2bea342dd6d1e1ab0a55df0473739 SHA-1: db13e9ca31f8fa1643375530839b46348364e848 SHA-256: 3771fe763f9af0007ce2a5d2e4d6b56dd484fb79697bd1e095b07d685f5ce2c7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=life+sentence+in+france.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=life+sentence+in+france PDF link annotation
    • http://it50life.pro/the_new_atkins_for_a_new_youffmeh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_6007ed245e19d.pdfIn PDF document text
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/f2a92c4399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_60025475f3ba7.pdfIn PDF document text
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/lolimimoposumid.pdfIn PDF document text
    • http://chambrehq.xyz/flat_stanley_books_in_orderavcml.pdfIn PDF document text
    • https://zelasiboromur.weebly.com/uploads/1/3/1/6/131606405/8459357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491933/normal_5fdf59e060223.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/29691016682lwbmq.pdfIn PDF document text
    • https://gavuzidawosowek.weebly.com/uploads/1/3/1/4/131413418/lojibizata-fifoxiguze-lenojavodumu.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/45c9d6d57dac40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_60607ca538d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_6047c9c779c1b.pdfIn PDF document text
    • http://brettlockhart.com/fofuvumopebazis7sg50.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://uploads.strikinglycdn.com/files/dfa7f62e-5687-4fe3-b7d4-d4e82b1fc18d/how_do_i_turn_off_call_forwarding_on_my_nec_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a9123b-474d-4ef6-8f87-06c465bab593/casio_g-shock_gravitymaster_bluetooth_watch_gr-b100-1a3er.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a102355-3bda-4b16-8473-ce37a18f2811/kudasajavefodopojoro.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_32e9696cad354eed94dffeeb464ce5af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad695cdf-7be6-4fb7-af2d-5608c8a82f3b/pipisodikoredavek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf273f1-83f0-470a-b0dd-1a8132ae0542/comfort_zone_digital_quartz_infrared_heater_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22648cbe-7279-463f-9780-61066544d421/67226684496.pdfIn PDF document text
    • https://298c7861-702e-4dad-8e6b-798164301c36.filesusr.com/ugd/98adb1_8c97341b10694a3c8623fb736d91e605.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_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 4464 bytes
SHA-256: aabd636bc34c915c55ed415c8aa99990632bd1b481763c86fc53bf16682946d0
font_01_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 11648 bytes
SHA-256: dbd2517f0aa7a5a45b5df87e867e8597d9ad0bf52dfa7a79177250675309e079
font_02_sfnt_off00015895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15895 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3