Malicious PDF — malware analysis report

Static analysis result for SHA-256 c012a94a6772f9cf…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 22:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 826309a4dc61c8cf3a7fa608ff208d65 SHA-1: 36338c1fbce3bd49504dd07121b156780f6c2eda SHA-256: c012a94a6772f9cf3058f1b0e331e0739f2921198c5ddea745b2a886c2cea6f4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-based document with a click-outward action, likely intended to redirect users to malicious sites or download further payloads. The presence of numerous external URIs, many hosted on potentially disposable domains, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://charontrade.hu/data/file/suwamatelozusiluzinopu.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210921144903.pdf
    • https://redac.ch/upload/gogidekezexufuratilu.pdf
    • http://rotang.net/userfiles/file/61553815795.pdf
    • http://ritadas.in/userfiles/file/xezemilusaxufenadotem.pdf
    • https://angkalaris.com/contents/files/sadizozaxon.pdf
    • http://tcgardening.com/userfiles/file/2021092005452773499.pdf
    • http://rwdwebwebdesign.com/img-aim/files/dezudopetububonerer.pdf
    • http://viorina-deko.com/images/file/medaxajokokekaw.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b348ded7ca---sadekasitobixufo.pdf
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50233063646.pdf
    • http://imhome-listings.com/userfiles/files/soviwep.pdf
    • https://ibshospitals.com/userfiles/file/vipagasalunodiwekorawap.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jevudos.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d44bc4e1a---70500049285.pdf
    • http://salonorganica.ru/upload/files/pibipetesigivu.pdf
    • http://lateonsettay-sachs.org/userfiles/file/dajutarojozeviweposaxi.pdf
    • http://benthanhsgfarm.com/images/uploads/files/kunumulisalonif.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/gagupeselifeguvilow.pdf
    • http://mannadey.in/FCKeditor/file/lefolarunisidosakakibal.pdf
    • https://dortmundpools.com/contents/files/30600334525.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/516954774.pdf
    • http://hflbdq.com/uploads/file/221851226800.pdf
    • https://labelmarket.eu/data/file/disexesutenibevades.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=accounting+principles+10th+edition+solution+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 16792 bytes
font_01_sfnt_off0000c826.bin
80764c2a829a000da2ff79cc73c98bf1d85ca86cb5d09dc827a0119ed4a322c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 14348 bytes
font_02_sfnt_off0000ebc4.bin
86e4658e856e7265ee8239a7e6ecf9bcf26ff9df721ace133b1da45bf9f3d4f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10992 bytes

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