Malicious PDF — malware analysis report

Static analysis result for SHA-256 b964f6033f01cea2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 18:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0746720bfb913f1697dce6db55090acc SHA-1: 3cd2dc656484bf38c56a9b70c34dc3b47ddf1507 SHA-256: b964f6033f01cea2dd5ea6499bb59b7ddbaa14137a51e78328e315d8ca485725
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains numerous external URIs and is part of a link farm, suggesting a phishing or scam attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=fake+debit+card+generator+that+works PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeevld431gthma17vv0hlhrqg2/metotonumomonifekep.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137801166157---patejakodilukiwejemas.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/37835135211.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/gumelogolare.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/19203693180.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/31941541389.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/bawedofoxegujopipuz.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/jogumepukapumid.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/57585293879.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210902053655.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/popomunenoruxixulojup.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/laliwuliras.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/revuwekirozasafigusifux.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/tonesakobogogazirakixeto.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/70435940711.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/fuzokuredonorikerubum.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/wawitewelitemufimokifadik.pdfIn PDF document text
    • http://electric-kernbichler.at/menulebidegomebamofetedi.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/86764988790.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/xasuxogikovekeligib.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/daronajuduxok.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/kewilijeweditanurowizov.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/dopumaxevemugapus.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98303316919.pdfIn PDF document text
    • https://kawanmto.net/contents/files/timogu.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 18032 bytes
SHA-256: a1b6212a0068f16eab4161ce0b2c2dda5b88d5769870890b4bda0a15c131575c
font_01_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A15 10900 bytes
SHA-256: 97a4763a1a08dd9e274675017474740b6a48d55901b1b929be5702687849cf6a