Malicious PDF — malware analysis report

Static analysis result for SHA-256 5306f868377e7535…

MALICIOUS

PDF

67.2 KB Created: 2021-01-15 13:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ca9f6f78c9c473829161f1d9bef7ff SHA-1: 7607e8b9120864f4130cbdd509645e58c2a3e1b9 SHA-256: 5306f868377e7535dbae7e171d4716ff8fa687cc11a101257b1efe3542ae49a2
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm designed to attract traffic. One prominent URL, 'https://traffset.ru/123?utm_term=pokemon+light+platinum+apk+file+download', indicates a lure related to downloading a game file. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=pokemon+light+platinum+apk+file+download
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5fd8f526de878.pdf
    • https://tuzuvujejoru.weebly.com/uploads/1/3/4/4/134442534/5866159.pdf
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5faed3bfa2db6.pdf
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/aca9559.pdf
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5fbc268659aa6.pdf
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/351547.pdf
    • https://site-1171661.mozfiles.com/files/1171661/basic_cooking_terms_worksheet_key.pdf
    • https://static.s123-cdn-static.com/uploads/4403819/normal_5fedc7c594543.pdf
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fad765d1788d.pdf
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5f9f83b67285a.pdf
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/zigesabe-xiwifivum-lisubigef.pdf
    • https://site-1175001.mozfiles.com/files/1175001/pokemon_evolution_dragon_scale.pdf
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fa4ed2d591b6.pdf
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/damomexefagokap.pdf
    • https://kezevamu.weebly.com/uploads/1/3/4/2/134266298/rutuzavajarumakol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92e.bin
16100107a3ff179a92456206c02a597b2814475c9e889ca49a08cc655238eb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 5340 bytes
font_01_sfnt_off0000db4f.bin
d4898e95d95509025e5db049fa1827b5c0d84f5277acfdecca77e6265e44f7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10708 bytes

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