Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f42b835fef2cdc…

MALICIOUS

PDF

88.7 KB Created: 2021-10-07 21:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aca0eca37c2ed2a8a568312363676f1d SHA-1: 7101d027a1046e47ef9df6accb4d4b6fd392d2a8 SHA-256: 98f42b835fef2cdcd1dba5c5d77b4f95ba4e01c96bab8be5deb01939991ed928
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=proofreading+in+excel PDF link annotation
    • http://proximeo.com/ckfinder/userfiles/files/jutifilologuta.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/biresi.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93042654897.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/fateburijaletorukipimuba.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/21464366065.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sugibepu.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/25346059635.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lukogamezexobuwozidisezu.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/72124888108.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/wonagafut.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20211003025451.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69144311800.pdfIn PDF document text
    • http://school15-tyumen.ru/f/femov.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/43722503287.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nm5ajlqj2vde4ne3p9u68lh9n0/gaxizavi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f88c8db37---85451345050.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pojazimatezukaxageri.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jikatixazorugak.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/95141219451.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/zalumelijerukaluxuw.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/derenifotikebamasofew.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/19426805095.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/xugosa.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/fezulipimarapoxid.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_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10488 bytes
SHA-256: 979e724a1f1e75d38be02cf5ca7b9e167ee59dd1ef3f2d8bd9b52df130a61a41
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 18856 bytes
SHA-256: 9653ca374c1f61b79ab70721c948bec0d1dbfb3bbab4e3c78bb06857ab26c49b
font_02_sfnt_off00013b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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