Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8e10209e6f09af…

MALICIOUS

PDF

75.5 KB Created: 2020-11-25 21:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97c372ece5ba6cba371796a6ed71d8d2 SHA-1: d9a943370887799179562ce8a97c578b4400f9bc SHA-256: ed8e10209e6f09afac3d519e659131c0153f0393f03b88a5035bd0c15ff08d0b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, including a known malicious redirector at 'traffmen.ru'. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://traffmen.ru/123?utm_term=can+a+square+also+be+called+a+rectangle
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/kadukoket_luwagosorel_selovorine.pdf
    • https://tomojuvugitem.weebly.com/uploads/1/3/4/4/134475437/432959.pdf
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/6e6cf9775.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/jaribasuve.pdf
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/wemezakiwopufo.pdf
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/7401541.pdf
    • https://cdn-cms.f-static.net/uploads/4498842/normal_5fb8154222866.pdf
    • https://cdn-cms.f-static.net/uploads/4420037/normal_5fbe1a3107579.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f58e1306-ba6c-4d24-ba6d-4c6045fc4aae/63562482047.pdf
    • https://s3.amazonaws.com/vufupu/pogovuje.pdf
    • https://s3.amazonaws.com/mozedijiz/wps_spreadsheet_full_form.pdf
    • https://uploads.strikinglycdn.com/files/993a1d6c-2381-4f5e-8696-2bf506f45af3/zaxozakejepabolakedu.pdf
    • https://uploads.strikinglycdn.com/files/2d1dc75e-aaf4-434c-8f88-28f6e74bfec0/partial_differential_equations_for_s.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d261.bin
92d19d4bfd92a77decb21f67f327901c6c193b4fc564191e1748582620f22d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 5280 bytes
font_01_sfnt_off0000e451.bin
c4742244136fed2da53de504f924d44344c5aeb8034c12386ece067e25b379d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 12048 bytes
font_02_sfnt_off00010ca9.bin
0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 16028 bytes

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