Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18c1067e75f0e2c…

MALICIOUS

PDF

93.8 KB Created: 2021-06-04 07:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 03ee01852931d32c587478af24f6dc6a SHA-1: 3e389c6fd7556f51c870c181b21eac77873397be SHA-256: b18c1067e75f0e2c1efcc52556e6d3afc5574c41ce112f7cfc04bfd4a4ef4c1e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/pbw?utm_term=precision+agriculture+in+india+pdf PDF link annotation
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/jitafagawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5fdfc9c79884b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_6017628c45c19.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/rafipubat.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417139/normal_60aff2be8b138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_6005b4facffe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ffa15d5854cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_601e4d6124339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_60550d473c4bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_606e2ac8311d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_604f02bda0d05.pdfIn PDF document text
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/8134972.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/78312f1a-24b5-4a27-98f1-22baa7d26c11/faduvikifiwodinopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f863b166-43ca-4344-bcf0-ca04bc8c5932/how_do_you_make_fettuccine_sauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb5dd63-6de7-4dc5-8985-07353bf3fea3/nanostation_loco_m2_manual_espaola.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/19505526637.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144596145/creative_advertising_agency_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d9944e-43b6-47aa-8d79-020951cce1cf/kusopezufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ed9bbe-2c96-410a-b694-87b7ef286a6d/3587505743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20ed349-4ec9-4dcf-ab75-d1bb325efd1c/twelve_sermons_on_prayer_charles_spurgeon.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 5324 bytes
SHA-256: eba36ad7fc8904016e3aa4b881997353cf18bffb4a6d96384030627ae1bb4f7e
font_01_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 11648 bytes
SHA-256: 270538d7c2792476d7345475d988179e4ce409d93339c187a6ca4c90b60d841f
font_02_sfnt_off00015539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15539 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90