Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3e4c070fa79ba5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 03:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7d0ba0812300340b786ebe1257a1f93f SHA-1: c649c0766a2f15cfe32e29bd0df5759492016f09 SHA-256: fd3e4c070fa79ba55a46b7e48b98f3cee40e44eac3fbc20fa77a0d91235a3f08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/kebanudedaroduribopipoz.pdf In PDF document text
    • http://travellerisland.com/files/28646108280.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/mowuraxuduvuzego.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/28583246087.pdfIn PDF document text
    • http://gewald.ru/content/Files/97525783505.pdfIn PDF document text
    • https://fivetc.net/uploads/files/37194039883.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/nefepagufukuzebokebuvet.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/votovaveteronupebagate.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/76897589184.pdfIn PDF document text
    • http://linza-market.ru/upload/files/dolulejamotivelimanavus.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vuvoxibuwezer.pdfIn PDF document text
    • https://rm-parketi.si/uploads/73707638263.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/popojojawimutu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/5092051042.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/43498991226.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/metigeriropuzabugefo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/renatogodixexoreremuwusel.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/94036718065.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/fejumotasupekevisipos.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/19653573973.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021932123438283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+golf+game+for+androidPDF link annotation
    • 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 17160 bytes
SHA-256: a1eeef594305cdab904ebcf97ae39e0972bfcb9d6ddd30778caca1509f5aefb8
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 10752 bytes
SHA-256: 5564c66f455a8f27ef3b67a525ea0b55c47fe362ac94f8c1b19f1b65e64ef9ad
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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