Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7758434a64c1a0…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 18:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a8dae14eba63110f0784cbeeb8ee94b8 SHA-1: f9463187e09b9109ce3d82c2f9539beddb834933 SHA-256: bf7758434a64c1a038a8a955f80e92771733f0f8c507f4613c0ceecadbc3e1cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, including a specific link to 'zajinet.ru' and a link farm hosted on 'cdn.sqhk.co', suggesting an attempt to redirect users to potentially harmful content or manipulate search engine results. The PDF_SEO_LINK_FARM heuristic firing indicates a deliberate effort to create a large number of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://zajinet.ru/award?keyword=ethnic+groups+in+conflict+pdf PDF link annotation
    • https://cdn.sqhk.co/kunimanujage/gjfidEL/witojatazosipaxolavamolez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_601b830a73ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_603b78c0f326a.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/ieC6icF/blocky_lava_viscosity.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/j8nZhdP/fefekaradarimodapadob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fc915c566f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fdb1696070ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fe30265ab770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fe289fe2f903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469101/normal_5fec8d88dc8a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_60566e20260af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fe0271f13bf6.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/gI5jfgd/batman_world_s_finest_box.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fce52968b7a4.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/tDwL3jd/sweet_escapes_design_a_bakery_with_puzzle_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_60615b8ea34c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fea3fe032a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_600b56557af75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_4cf4583012d5459e8506e89af6f793ee.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_047765af9b9c45d7885f048af15f8b6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/2019_acc_anticoagulation_guidelines.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_56bbe0aadae44652a7e232b36ee11fa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/20243516711.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/john_kenkel_analytical_chemistry_for_technicians.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 5164 bytes
SHA-256: 2959d1b6fcaf9b2458f880c480fd828a1afc2c5d584a7868d069a86365e2a340
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10736 bytes
SHA-256: 1e9a74695a726adef6f0a5d5649223d9b86523ee3f7c97fca494301212a3567f

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