Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dc8b9ee048d730…

MALICIOUS

PDF

76.3 KB Created: 2021-06-04 01:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58759010741dd971cc520a21141c444 SHA-1: b5e9d494522d3d17de9c9ee114b91e7c7dc1de40 SHA-256: 65dc8b9ee048d730291061b1fcf39bff00fcd49f8f44224acb56ca52093ac1ab
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to contain metadata related to its generation by wkhtmltopdf, but no clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/pbw?utm_term=wir+lernen+deutsch+1+pdf
    • https://wezedamuj.weebly.com/uploads/1/3/4/4/134480618/zonulepitorebagora.pdf
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5ffb06da64895.pdf
    • https://wulidinuwiniz.weebly.com/uploads/1/3/5/3/135326152/balulodarori.pdf
    • https://zobezuked.weebly.com/uploads/1/3/4/5/134502366/618b7eae.pdf
    • https://xanilavobug.weebly.com/uploads/1/3/5/9/135959945/9109249.pdf
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fee5118b7019.pdf
    • https://jimiduwukav.weebly.com/uploads/1/3/1/4/131452794/seviriwewigewexe.pdf
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/ganalemirosogufofos.pdf
    • https://cdn-cms.f-static.net/uploads/4491426/normal_603238f49ce83.pdf
    • https://pedutiwoda.weebly.com/uploads/1/3/4/4/134481784/vopisuj.pdf
    • https://nuranisemamev.weebly.com/uploads/1/3/5/3/135324344/8da806233b8e.pdf
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/5c3211d59e195.pdf
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/106693.pdf
    • https://pozebukewif.weebly.com/uploads/1/3/4/3/134330137/nojivizeradenofoz.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_6015a6e030b71.pdf
    • https://static.s123-cdn-static.com/uploads/4500425/normal_60093b0baf783.pdf
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/7170374.pdf
    • https://suwanofanezelon.weebly.com/uploads/1/3/1/6/131636577/3821298.pdf
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/5359889.pdf
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff6595c9aed7.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6017a288b4a4a.pdf
    • https://kipejuxi.weebly.com/uploads/1/3/2/6/132682137/2823893.pdf
    • https://fewewoxeluvatu.weebly.com/uploads/1/3/4/3/134338934/ddc5b6a013eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e923.bin
e82b1ddf7fc38979173e35c2c19d1574e74d2b53ba0144376a059e218ef8245d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 5096 bytes
font_01_sfnt_off0000fa8c.bin
dc993964212fbbbe22cc1e8f03cf5023704d4581b0240f72dbaaaaa2f39c89c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 12892 bytes

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