Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77559e201a798eb…

MALICIOUS

PDF

67.0 KB Created: 2020-12-16 03:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a5135647246f21d514ff4dc565e41e73 SHA-1: d39a89fdd121401b9b278578b47de9b57f1d6b6d SHA-256: b77559e201a798eb2795582ff7e722ed1760616dca242e0ba555c82e041c43c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • 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://traffset.ru/strik?utm_term=bandai+millennium+falcon+1%252F144 PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/pivem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fbf7f627cf91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5fa07db142b86.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/dexizodibuna-sasutumun-bifofi.pdfIn PDF document text
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/d7c2c52de5a349d.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/wigasanas.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/rotazojegisuv_bujova_runanukule_pamizixizepip.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/duligaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_5fb7676cb19f3.pdfIn PDF document text
    • https://gavuvikiji.weebly.com/uploads/1/3/4/6/134674568/biximusaxukenipepeg.pdfIn PDF document text
    • https://jategolotigani.weebly.com/uploads/1/3/4/8/134882723/maxumukekotajeb_dedivokape_xorebur_patikur.pdfIn PDF document text
    • https://panenojaro.weebly.com/uploads/1/3/4/4/134482399/5648402.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/kotenu/artificial_neural_network_book_free.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_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 5116 bytes
SHA-256: ae1e21775f150a4ad8fd1471853514f6bb9c2758cfd53ce2542ab586b6fa37b6
font_01_sfnt_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 11060 bytes
SHA-256: 32b2506b62f92549f361d86282e67d1b54ed72fe560f1d99187657c66d812bef

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