Malicious PDF — malware analysis report

Static analysis result for SHA-256 2413d15e0c1d3253…

MALICIOUS

PDF

66.5 KB Created: 2020-11-25 11:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 760dee9556b28f2a418382a8011c6791 SHA-1: 43978d146d4ff896ffbadf0830d6c7fe4f341587 SHA-256: 2413d15e0c1d325343d2b45bc39b3b8d462936ebc94fbcf29f8abdda37272b0c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://trafficel.ru/strik?utm_term=vcu+acceptance+rate+and+requirements', is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/strik?utm_term=vcu+acceptance+rate+and+requirements
    • https://wugemevafiditi.weebly.com/uploads/1/3/4/3/134382928/f77948d3.pdf
    • https://vurifupilubat.weebly.com/uploads/1/3/4/4/134495287/e5fedad6bbd0.pdf
    • https://xerukarikudi.weebly.com/uploads/1/3/4/3/134316935/6345525.pdf
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/vemulowurufakol.pdf
    • https://lidikizibapusak.weebly.com/uploads/1/3/4/8/134883913/divale_zowolasi_komarerakane.pdf
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5fbb2f03ea4b8.pdf
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/5647151.pdf
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/bariwugugu.pdf
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/vavurajow-lijubani-xesesakume-zedibazadap.pdf
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/01bdaa4eafd70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefipa/vavimesesog.pdf
    • https://s3.amazonaws.com/mozedijiz/complex_fractions_word_problems_worksheet.pdf
    • https://s3.amazonaws.com/pogolo/distribution_contract_template_free.pdf
    • https://uploads.strikinglycdn.com/files/334bea7d-48a0-49d4-9e62-fe279da4e1b8/as_24_le_mans.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c731.bin
09ec6671add83ca0e3b449ffc577bc008ddfd1cc8557535f5b2f7a21ff7e7253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 5280 bytes
font_01_sfnt_off0000d915.bin
2c363d65716a7d4a5dfb7840980526fab95678b61bc4e682f4f7466fc229949d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 10496 bytes

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