Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc50d0ef669f03a…

MALICIOUS

PDF

78.8 KB Created: 2021-03-15 09:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6433d0911d0b306a87ae327a2d088e6d SHA-1: 91aade16240988b1e04ce503797c2d19d36bd86e SHA-256: 7dc50d0ef669f03a3ed1f78fc8b42a4df0a29f6a684d5e54a695108f685e1522
186 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. 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 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://nipisod.ru/strik?utm_term=diablo+3+nintendo+switch+cheats PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450733/normal_5ff4d214e62a5.pdfIn PDF document text
    • https://powujuraw.weebly.com/uploads/1/3/5/3/135321569/kuruwab.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/gezomixilaw_xexezutisab.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/AWNiaib/jetpack_joyride_cheats_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_600b347224a43.pdfIn PDF document text
    • https://bidiruvinevuf.weebly.com/uploads/1/3/1/3/131379477/3351793.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/82433d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6024566dbdaef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_603acfc3da1d8.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/ggfidhe/gizezikomikilutogagi.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/n1bjijb/photo_collage_making_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/zhagdgi/xateko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5ffa45124d587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fe690c02458d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_6026d74403da4.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/dIOjiib/fruit_ninja_classic_apk_obb.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/zewawa.pdfIn PDF document text
    • https://jagofejejo.weebly.com/uploads/1/3/4/3/134341531/7259799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_e83a84d79a284abf97ba4d10ed045ddc.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_c2e4beb0f37e4ead8a43cae06d7791ce.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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 5324 bytes
SHA-256: 22b18c70216c4ea9c48bcef59fb5201388f45170169d84406dc4bc32f607dfd7
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 11084 bytes
SHA-256: 5fc26414fc96098297938fbccf26c0786b78411f8a070e84ef205c9dada0865c

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