Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4555a1c10083c04…

MALICIOUS

PDF

89.6 KB Created: 2021-03-16 02:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ff7a3d015e5ee9763317c62a891d0a2 SHA-1: 72ff9f15913b150658efdce694b212abaae29c0d SHA-256: b4555a1c10083c048cbf56b30535925dc214ecf82d0919b9591e4fc792326045
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9992

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=allavsoft+chrome+extension PDF link annotation
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/fimug_mixaxipejez_mekeviwurivizuv_rekagefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ff773073fe3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5ffc1b4ce3596.pdfIn PDF document text
    • http://simenejigixera.22web.org/cancer_de_cervix_sintomas.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/goletetudodajuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ffa3c76804ac.pdfIn PDF document text
    • http://yildirimotobursa.com/zilefukadopexowekqnmx.pdfIn PDF document text
    • http://securespot.ru/6687511316857opx.pdfIn PDF document text
    • http://kukushpa.fun/vofuzemozonusedurusutufunrovco.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_601ce2ee07b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_600a109e6886e.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/34ab5ab0e2bc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_603b268e07caf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414336/normal_5fee710e5bac4.pdfIn PDF document text
    • http://bawesijum.22web.org/how_to_sync_jlab_earbuds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_603c09d96c3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_602069b857249.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/1625731.pdfIn PDF document text
    • http://nupubidodeje.22web.org/silaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_600e7620e1840.pdfIn PDF document text
    • http://qrettalq.online/parachute_80s_arcade_games_for_sale0dl29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pilazi/77274636445.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/aplikasi_beetalk_versi_lama_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/nipofidemasakogo.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_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 5240 bytes
SHA-256: 814a47701f1c8a3418c68489be2b4d7d6f5913098f2a1911026eed30508c40ed
font_01_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 10988 bytes
SHA-256: ad8bd567193808e8999ecc6cab18c17b8d739310e8531cee63adee1f9c1ab769