Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6465bff9c8701ed…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 08:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a646d58061ac540d88d7edd03ef1de14 SHA-1: b8dd4d5e49d42c9df43004b7af370fb971843bad SHA-256: f6465bff9c8701eddff6c51ccb3ff01170a8eecfa29ede6a9de15e9e44e58859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The presence of embedded JavaScript, though not directly analyzed here, suggests potential for malicious scripting to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crownprolaw.com/userfiles/Proj_Name/files/86141955687.pdf In PDF document text
    • http://thetestmag.com/userfiles/files/padixomasonudujadoki.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109130801573527.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146657e3b5ce---9418150961.pdfIn PDF document text
    • http://tai-group.com/upload/files/jaresuneruzibolevukudol.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/3947097417.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/mapufawuwunameb.pdfIn PDF document text
    • https://km2804.com/ckupload/files/74742533224.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/3682219841.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/moxizipulujaf.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/rukura.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42653854011.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9871d8ea63ac81dcdcefc869c961001c/31778435709.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/valokeworexagoxuvov.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/61950838994.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/80196024695.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/wapixifegegifone.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/45520905630.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/59635348939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=biggest+country+in+the+world+top+10PDF 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_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 11156 bytes
SHA-256: a7db7dddfcf70662826c05a3abc30666a09c2c244e9c8f4e8faab3ebcc4965d7
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 17484 bytes
SHA-256: 11ae7ea4c67da8b866fe6722168f3ea1ac68c3030ebbf9aa483e9909966f36bc

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