Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d246d679d595e59…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 07:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec82d3eebe89d95bb1558479a3a0048d SHA-1: 3c5b066f45edde1ebd7d6d3c366aced09522f31e SHA-256: 6d246d679d595e59bb86444b5bf6dec9c16574b9c06afe18c35269d50e4dda75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://enewind.com/pliki/file/60857678194.pdf In PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/buvubalagopoduxulamilik.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/52037294473.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/bopukojuneremomad.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/govejejudusevov.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sovatelizawigosawa.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/21762769117.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dakurawibux.pdfIn PDF document text
    • http://manu-transport.com/documents/file/97189390157.pdfIn PDF document text
    • http://klenderbio.com/upload/files/31963019277.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/45091134722.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/51707528292.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/96911783377.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/bovemokewumaf.pdfIn PDF document text
    • http://espokebar.com/uploads/files/buxexemijowosirujakevolaj.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/giwakipukakapipoxemerolas.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kafowobozuwopovilajemoxu.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/13965262970.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/95718978278.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/85281167098.pdfIn PDF document text
    • http://tchid.net/userfiles/file/fodezivafotub.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/14638592759.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/xekedajebofeke.pdfIn PDF document text
    • http://brukbet.com/user_images/file/denomopexujaxa.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/73029173924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=second+partial+derivative+calculatorPDF 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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 10580 bytes
SHA-256: 3881f01c3044d8e7e56b528a5ee864a2bcb7c5c942020a067d721cbf0eaac6fd
font_02_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16960 bytes
SHA-256: 1e2f5968089c742b184dad0855bb6734122bb38b006085df0a18f62a703f92ea

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