Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca98cf07eeeb3f8…

MALICIOUS

PDF

76.5 KB Created: 2021-05-14 08:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b194ac0c51cc1db58322c4f8a4fdad1 SHA-1: 92cd275f097d1608862144ede6c5d76cd91bc263 SHA-256: 9ca98cf07eeeb3f8bf8bbc71c845fc9473bb6895848a3f9add2d3d42e912a009
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 0.9960

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://pelibifir.ru/strik?utm_term=mbo+folder+user+manual PDF link annotation
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/buxaratolakuvigenaja.pdfIn PDF document text
    • http://form-copyrightservices.com/95389066063pig0v.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/J4EgdiJ/gozezeximijabakegikatiwoz.pdfIn PDF document text
    • http://13millions.store/vowonikowovunigaso53syw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424007/normal_6001434a5c3ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5ff5f1c31e8ab.pdfIn PDF document text
    • http://tertov.xyz/82414531139uk9nk.pdfIn PDF document text
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/silasox.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/25c8d282.pdfIn PDF document text
    • http://kind-insta.site/sample_answer_sheet_for_let_2018em89r.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/iidMgcW/lbs_to_kg_calculator_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_603808dd95212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_604510518b5d1.pdfIn PDF document text
    • http://bullbananavannaone.xyz/kevesoduts18.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/fhjosH2/waganesewusaganuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5fc8deb4b3975.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/f2ebc94bf53fd37.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/Eighiji/loop_of_henle_function_class_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_a6d827de037848949542def462aa314b.pdf?index=trueIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_bdf1caf6aa3647bea14caf772cb0a927.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_ebc82649926e40b49f8c4f5c82f4b381.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_eaff76ef69d74230acfc5392196d098e.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_2eca7ab189874668934532f1a43f7ed9.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_49650f93e37d4e31b00e0e08c38ee0a9.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_f79ec735306841ce99187aa9f2f38e16.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_eb98d52ad6ec4fc2bf07bc6bfa20d1e1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5200 bytes
SHA-256: 35cd160d0023071ef0ddee7b093bb570c78680187fd01db92b3a024a9e3c28bd
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 11076 bytes
SHA-256: 034c3f13f98be040fbc7f09c398ece3df0f315bab956a06bd10e6eddbc5fda43