Malicious PDF — malware analysis report

Static analysis result for SHA-256 901156203eecb8b7…

MALICIOUS

PDF

86.6 KB Created: 2021-10-09 05:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58a610a2629f588d20be4a4c0e1b9f4b SHA-1: a28a0fcfa9657fa370a787b291cb39516f7918c7 SHA-256: 901156203eecb8b72aa01bfeff4a88961bcbbb2d108a13cc8635fa12b98258ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to potentially disposable hosting, suggesting a link farm used to obscure malicious destinations. While no scripts were extracted, the presence of many unknown URLs points towards an attempt to redirect users to malicious sites.

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 https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/448602d17e7da46ba4baf75040a12ce9/xinanemeref.pdf In PDF document text
    • https://sharedsynergy.com/userfiles/file/13749116800.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/37159652009.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/dafatikob.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/51195201201.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/retonopogigaraz.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/juresupuwogunewi.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/16759171759.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/8244923834.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/23275873073.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/75764380717.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/digojelixigilipugewof.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/xapipigelobarawijazupat.pdfIn PDF document text
    • https://bloomeng.com/uploads/39622018299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+your+ideal+job+interview+answerPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/78706643916.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_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 19740 bytes
SHA-256: c310847ac9cd1c7b8226e7c376948e9a70b5716b961b2f48dc54f485d0d0089b
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 10976 bytes
SHA-256: f9d30047b5d3ae5db249497fce7b662a449790ba5ecf2b6132ef09a2732fba5a

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