Malicious PDF — malware analysis report

Static analysis result for SHA-256 929aad4c63ed69eb…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13f6b992a2f14d1080b5cf8af36b9921 SHA-1: 61b797275aa7a036321c4c777a9864acb7b50fb3 SHA-256: 929aad4c63ed69ebbccb618cc1d39b9251f9b236a5c4b38eae7bb7e4c4360c01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many with UTM parameters, suggests a phishing or link-farming campaign. The PDF structure itself, combined with the heuristics, points towards it being used as a lure to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=find+parabola+equation+from+points PDF link annotation
    • https://dcimx.com/files/28392405569.pdfIn PDF document text
    • http://sun-eko.eu/files/file/fodonumomurofagenevol.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/57545294313.pdfIn PDF document text
    • http://na3.it/misc/file/fumilirazamamata.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/fibezuxefadizunitivuvu.pdfIn PDF document text
    • http://centrons.com/uploaded/file/9833963586131aad583c67.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zemodiwagamiweleliw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139867132d76---gowawunorodanewuxuno.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pisavujam.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/8038290342.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ab03e515e499abb62148d834b3be8ba1/pimenovofazatajibotugopaf.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/21426574424.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/15911623990.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/17052152711.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/lawobobakawi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/punokum.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/galexelelori.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/55633691172.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/3285442685.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/15947665858.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/fokabawomojofuz.pdfIn PDF document text
    • https://everestart.com/images/stories/file/zadajesurerawasivizezadu.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_off0000be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE21 16180 bytes
SHA-256: d4c3944b172b58a79100819f4921dd3061cda7783b5ed3b29496d67f3d734c49
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 11020 bytes
SHA-256: 7bdd9159df774b88c91b94cc9314bbdd48a7b0136a19d3b3dac27f22f1661ca1
font_02_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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