Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c9f665bb34599b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 17:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0bd0a0cf65d5dae8b0a2c46343f152e SHA-1: 90c2dc6ff541cd85620ea9b7fe7d10f9c0a1e6de SHA-256: f5c9f665bb34599b83cd1fcf96fa5280af2cafffae3567e7a536bc0e0fe78c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary goal is to drive traffic to external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://iltorg.ru/upload/file/desam.pdf In PDF document text
    • http://cuacuonductudong.com/upload/files/20126060619.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wazarozajitisaxobomom.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/762373426.pdfIn PDF document text
    • https://armenia4d.com/contents/files/90212858700.pdfIn PDF document text
    • http://jfe.hk/userfiles/newelurulukumaruwefori.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/33430375788.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/maviberetelik.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/41931279407.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/36603996410.pdfIn PDF document text
    • http://ave-france.com/pics/files/parabaditowokozuborijenu.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/45171535703.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/fetapopizivujojikewo.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/pokuzujusatuzase.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/44a12eed9f02681ad2216e7926b3d619/32062776310.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/jenevididomutisetolibiz.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e287f24e---wewosuzedewareguxut.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/22810562799.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/dopevofuzijitanez.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/zuwiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+app+for+live+train+running+statusPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 17768 bytes
SHA-256: 0e5779159e0fa808b4f68ca402bb513781ebc77252074f158faa120baf47537c
font_02_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10752 bytes
SHA-256: 9cf6aee1ab9b6a54e3f93fe91b181260e676d3415991e86cf25b2112aee3cd00

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