Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb9c1f40d6aa148…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 01:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8c1535de204d47c277eef266a75ed510 SHA-1: 96bb438774c61511d4eb613659e9b624e09c2d8d SHA-256: acb9c1f40d6aa148d0fe5a2f77d590a433a20782a323396a8f3cc9135c44c8a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gemma.lucien-sv.info/uploads/files/613f2fe782465.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021913950309296.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/82014104554.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/30842054551.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/jeturimimadamodet.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ruridevotet.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/dazixemawuxolobosokufaw.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/83440424869.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614012799ce40---vunisigivigoxawenok.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/63583980673.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/94639323589.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/medolibopagutudiv.pdfIn PDF document text
    • http://schokobrunnen.com/idata/48601472207.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/gigimevorax.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/sujanokakupurimusa.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupovoture.pdfIn PDF document text
    • http://elitvorota.ru/f/file/76458655178.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/lupunidizojukumim.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2b1f123799fbd191a21881fc600e18d1/purikipunelivo.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/59820991668.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/31001354248.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/94627883699.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/malononifejiwuwam.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/55161232856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sketch+apk+downloadPDF 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 10504 bytes
SHA-256: ce8471b17bc5ac649ecdd4a3ead81a1c9d74457546c7037d336216e812f38172
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 18336 bytes
SHA-256: 149d6c4684ebd5e3bcd9cdb3fd3afcb5dc240606667f767990df555af5729570

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