Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3bb991a3728a9e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 04:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1fde73f3713871f6c8923c636ca1cea1 SHA-1: 68c3efc9af583137b5b73ab15bac2894c29b0f80 SHA-256: da3bb991a3728a9e1a9fecf991a83e2e5d19eb7150ead936cd7f85ee959c99a8
144 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one pointing to a raw IP address, indicating a potential phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document's purpose is to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5852

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://phukienbep.net/media/files/giwigavawefiwixatisufi.pdf In PDF document text
    • http://chongros.com/userData/board/file/14352696874.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12220857420.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9108a948a4ccedb27ac5cb29cbba917a/liruniguv.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/kuxob.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/karuweravugitopu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/29184432141.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/61762161540.pdfPDF link annotation
    • https://catequesisnavarra.org/guiarte_userfiles/files/94975754505.pdfIn PDF document text
    • http://hasyo.net/files/file/gafogibir.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/dirizexolorigukudenam.pdfIn PDF document text
    • http://boldogelet.hu/media/29302843743.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/54297688387.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/65543382097.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/jaxaneg.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jujajikixumoresututijal.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902191723903085.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/33194027026.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/pefobavanivezup.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/35525084785.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/virosadote.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/sivafisojatafog.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/sageliwis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=game+of+thrones+season+1+episode+1+free+streamPDF link annotation

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