Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d6611e6c7aea1…

MALICIOUS

PDF

76.9 KB Created: 2021-02-16 08:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e61ac4b68362041f902ea69bf0941ae SHA-1: 1bb574c22f26054ef83e50bc147693f4a49ed502 SHA-256: 501d6611e6c7aea1a20909503386809deb7fcbc5a8bbd45f39e3b3f258c10011
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=unblocked+games+pokemon+sapphire PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fc95e9d22e01.pdfIn PDF document text
    • http://tdsevsvet.ru/cooley_go_term_sheeticgm6.pdfIn PDF document text
    • http://rastet-malysh.ru/67548483016ovkl1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5fdbe547dd4dc.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/Ngejgjc/amazon_discount_coupon_code_for_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_601722b187b5e.pdfIn PDF document text
    • http://it50life.pro/99313443254lcgic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_600fe54feca57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fc8424a0ffff.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/jjahglK/voice_translate_spanish_to_english_speak.pdfIn PDF document text
    • http://genusttwsr.fun/tunegilelodemonigom24ggd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_6026a639c5ac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fc6dce64534f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_6009d0572ad3a.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/rij3hdP/96078638181.pdfIn PDF document text
    • http://islandlandscapesbb.com/sejugebipanewen2t70u.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/tobito/yfn_lucci_hit_em_up.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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 5684 bytes
SHA-256: 36fcab5ca9898cd3ea7919b8c95b3ff3c283705a0174c8ccd466f040f7f591a0
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10492 bytes
SHA-256: 26553ccb4fc0fb645b4562a695d43dc32a3d54dfb3d582cf40a918a87c48c229

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