Malicious PDF — malware analysis report

Static analysis result for SHA-256 776f808c39ed76d9…

MALICIOUS

PDF

74.2 KB Created: 2021-04-22 17:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d76db043868ae663dd6433df8a1a8aa7 SHA-1: dc32c0374cb8420b1be48f3af22a0f13dfb37907 SHA-256: 776f808c39ed76d9d63a2db7aeccb0641527e44e1324571302bd1e395f3a91ef
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, appears to reference a product review, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=hori+onyx+plus+wireless+controller+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408865/normal_605fb831635cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_602f745fe3b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_603b9c3d60184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5ffc9ba4311fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_605bff0b43cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_6024b25180c5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5fee1fec6d8bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5fedb31f6ed41.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/vezumobigodub/nissan_armada_2007_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1967bc3c-374b-4ce4-9516-4bf707dbc95c/53563417611.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/62904516754.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_93819c53edfa4b98bcea4dfe281ecc71.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_a2b6ae1eab574224af047154debbc2f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1a62f2-2f5f-4928-9470-d06c61647a7a/37454177294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52acbcc-33ee-488d-95ba-4f3e7b57e4e1/why_is_my_invisible_fence_beeping.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/weber_grills_on_sale_black_friday.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_e790d37b8252440982c387ae8ae5def4.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_aef041f94a254b9bad60a5973109bcac.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_9f6727bf0526474aa7ff0658f349078e.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_b9b7d7dc318648308ea5f6665bed8beb.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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 5000 bytes
SHA-256: 8cada28aef2659f4c31513cb99d7e06b40daabe7a076668e5d6c08b2786b285c
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 11232 bytes
SHA-256: 34f2b94b057e6271e1be5d3ade149de6fa04d1b11e5d3519add0398ebd293931

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