Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b3261454614e16…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 12:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3405d5d3406c256dab762799d3bf5c23 SHA-1: de85db77ff3c6afc496aabde627fd59fcd7ab6f5 SHA-256: e8b3261454614e16bfc1bc5b3a5dbee6a6b18a5a270093ddaf083c7dc4bd5e70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the idea of SEO manipulation or a phishing lure. No scripts were extracted, but the presence of external URIs and the link farm structure points towards a phishing or malicious content distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://mygiftltd.com/userfiles/file/tonunujorotelekozamoj.pdf In PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/57479450179.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wanusof.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///27461120718.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/1499596373.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/janolevoxiku.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/96362883654.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613926201f3ab---kikuped.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/vakofomovebodagu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/9321596930.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/limonoraxojumunex.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/40868161921.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/35130412946.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/sajumuvutanax.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_67A094FFD6CA91C3.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dcc3687c---82969488353.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/zidegekisibabexe.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/12883857943.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/merigiwokewa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bagarupavew.pdfIn PDF document text
    • http://moretonassets.net/userfiles/siwifomibudabekiw.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/jidodi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/35184545249.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/pewofifivoveboziponuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=deer+hunter+2018+hack+apkPDF 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_off0000b22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 10740 bytes
SHA-256: 48df41936268da1ebe01a309c1231e7f93b00b20bb232e75247b1135dab69596
font_01_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 15824 bytes
SHA-256: 6c10136a34c122b2309e778c60526ee15873cf7a3ffb86454a49a1b47bb31093
font_02_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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