Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fabbc1d12954bb2…

MALICIOUS

PDF

39.0 KB Created: 2021-10-08 19:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 185ea1d550692ace634567f90e81a5dc SHA-1: 91e9e7f37c509fa24c8dcc4f64c6cabda158fe3e SHA-256: 8fabbc1d12954bb22a15a40cc00d48c138886258373ddd46bd2682cfea49a8f1
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's an image-only lure designed to trick users into clicking an embedded link. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for human consumption but rather to host clickable elements. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8883

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 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
  • 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://synerhu.ru/uplcv?utm_term=secret+life+of+bees+quotes+with+page+numbers PDF link annotation
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/271651374018.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/68466680369.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/gumubigukume.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/72647578591.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/96358588343.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ad1946360---texurinawopo.pdfIn PDF document text
    • https://argumentua.com/i/file/zozajewuligawulazomam.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/levejarujalo.pdfIn PDF document text
    • https://emenu.hu/editor_up/13031855444.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/78722018801.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/24459494231.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/12055782679.pdfIn PDF document text
    • http://htwy.com/upload/file/73436341173.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/96054454569.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a819f6a7a5---89682720319.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/85251291062.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/17596781183.pdfIn PDF document text