Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6315dacffa8682a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 19:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05197f8d4e5c81b3b6563cea4b163016 SHA-1: e8007c4d2c04147f022a50834d28b687470ef4ec SHA-256: d6315dacffa8682ab9fa4267af87150fd51001782caff612627952698fccd787
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e789688d3e---rilut.pdf In PDF document text
    • http://alacarte-grafik.de/userfiles/file/wufiradevugikivipibakam.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1504197309e8c8601760d6c9343ea6f9/59843841754.pdfIn PDF document text
    • http://vanhacollection.com/images/files/wegibimekojedamopanegoba.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/xeburo.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/99662284234.pdfIn PDF document text
    • http://rideco.hu/upload/file/mojigoxetatagozi.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/sisijadisiwavap.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dofoliruxukegekeragavutav.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/13423127314.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109141009418621.pdfIn PDF document text
    • http://symbolfoods.com/files/file///66419741769.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/dusilanomu.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/nudukanonu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/netunapubevijid.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/fisoki.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/xamigoferunaxibop.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/sitizofalivizoweloparozu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/77414055132.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zanoxogoje.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_B89804BC39DA495E.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/28884662220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=notification+call+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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 18412 bytes
SHA-256: f89c4dcb3057cd78430d34b53f73a7ac1374f2df0a4ae9da17c0f9a489267765
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 10144 bytes
SHA-256: 0cfa4a97bab7a1ada6333c3b186a999bdd257bb5baf5f3c3da623b1c21dcee37

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