Malicious PDF — malware analysis report

Static analysis result for SHA-256 9767f5d9ed343b39…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 04:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffc78895429c527a46b43a62efc81155 SHA-1: 94ddf8f15afa987723e26f844d53d603c36c18ac SHA-256: 9767f5d9ed343b39c97033248b2b99ad25075ce414ed86bffde89ff804e3a16a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this document is part of a phishing or malware distribution campaign.

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 http://rosg.net/sa_upload/userfiles/file/20210903213401.pdf In PDF document text
    • http://canoeing.by/pics/files/8176369106.pdfIn PDF document text
    • http://bjallstar.com/upload/file/wigogekeriniwukexalenixis.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/54441185082.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/61390187921.pdfIn PDF document text
    • http://nature-revive.org/files/file/jivepujuzagav.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/52833645877.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210925135442_5o9nkt.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/43a33330755234bf6d32f0c8b328adfd/vupodosab.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/6632021352.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/35370179248.pdfIn PDF document text
    • http://tyextractor.com/d/files/55525297289.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/fiforovi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9c3b4039---32801000063.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zevubiwilifi.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/93194428243.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/73425684631.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/rixosumizopuvobofekazi.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210922_042725.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/repoxidomexovudusewunu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=windows+7+professional+64+bit+key+2020PDF 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_off0000ab93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB93 11456 bytes
SHA-256: 684053a50afbafc7907729784b3fcc347d5056c381e448eed374a738f91adcc5
font_01_sfnt_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 15056 bytes
SHA-256: 7c7a0960f1585d6e8fa0f8096fed61ac134cd6ae5de48beba1ea5ea821828a3d
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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