Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08cf4c94c5b2856…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 10:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f26d86919e9ea072e3e0a1e9f25959d SHA-1: 4c022afbc8a0bcd07826ec2d60037d3cd0067aa1 SHA-256: b08cf4c94c5b2856b949ac17e1a752ee0c9ee2a0accb1ac2b307c28fa433f1fd
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=it+stephen+king+pdf+english PDF link annotation
    • https://gberwanda.com/gbe/useruploads/blogs/files/5788525126.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/28704887152.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/58681493253.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/82415077199.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/wotam.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/jujegugufojazusibirofu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/24169813677.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/zujefoxepixoj.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/10397243284.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/piwoboraketigenosofo.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/70569454091.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/sapawow.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/30655799765.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/34612204313.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d91b4a060---zadojotarukexopotoz.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/86025791925.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/41233249689.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/92058101401.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/26006308656.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/47984794729.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gl97546asehp8agqq0jdssh3rb/dadavufatuveviwefuf.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/vebonafunudutux.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/bazefutusogikijosupomudil.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://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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10436 bytes
SHA-256: c0664abba11617ad6b495a03f0113464984e33e4b43a34d83f3e098f9afc32f3
font_02_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 18828 bytes
SHA-256: bfd4fc18c0c16826485cf58fb0c155c457bc6cfaeb40e2aedf393975643144bb

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