Malicious PDF — malware analysis report

Static analysis result for SHA-256 165627497c3b477e…

MALICIOUS

PDF

88.6 KB Created: 2021-09-15 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 56dbe76d23b45ac7b8175102bb4c47b4 SHA-1: 46c1679bc94e9014c96db7c443479906b0bd2e3d SHA-256: 165627497c3b477eda1d148634baa08d9cbb62ffd023ed5e614011bf6e5498b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm, pointing to a potential SEO manipulation or content hosting scheme. While no scripts were explicitly extracted, the presence of numerous unknown URLs and the nature of the link farm heuristic suggest the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bodymason.com/user_uploads/files/lazaxipanovusuxirixuvus.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/fabimusizivikupubagolide.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/tutaliforabobasonakomalof.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/66379783106.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/nazekemuteru.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/96353954093.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/38148058994.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/63966446312.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/kemin.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jotetunadazuka.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/bavudisevotoruxosevo.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630758560.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/88147105431.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/susikaze.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/62659369612.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/98154474947.pdfIn PDF document text
    • http://jadeite.ru/images/file/79560571691.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/16532811294.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vipikuwagulonizusikulatuj.pdfIn PDF document text
    • http://epicridesnepal.com/files/bodujomovagixagudiwibufoj.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/69794301169.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nakolozi.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/49773394379.pdfIn PDF document text
    • http://bienbao.net/uploads/files/wefim.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/97444483106.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/muwoledugokitowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adventure+games+list+for+androidPDF 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_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10844 bytes
SHA-256: 2a1bf9e443839ccb56cdaa55ac0a2281b797b38985159e8fa84ebf9d5f10904a
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 17988 bytes
SHA-256: 4fcbd084a4284efccf7b75d28ab83b624d38caff2f3896b6a9fc01c440e8defc