Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9b41126e675c85…

MALICIOUS

PDF

72.3 KB Created: 2021-05-31 02:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f1f35da3bea2eb3b8db7b5c7c67a79c9 SHA-1: 2ed14e9007bf1553a9ffe6eb84ef2155ed33f6af SHA-256: ba9b41126e675c8577586136e814c37a06ee1091a6bd095222ea2e33b85d4f00
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the embedded URLs and link farm heuristics point to a phishing or spam distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=disclaimer+of+opinion+audit+report+philippines+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408172/normal_600c35b443403.pdfIn PDF document text
    • https://kamurodogoruvax.weebly.com/uploads/1/3/4/8/134887894/8776614.pdfIn PDF document text
    • https://jupifezugaj.weebly.com/uploads/1/3/0/7/130739886/rerexije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_606e2f27636b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_603a3e7c69a27.pdfIn PDF document text
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/6967432.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/makefabejoxuxo-buwag-puziwonu-lewoloxofikesuv.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/dujetediti_wasafagowawivux_sokuvamexi_gabisovu.pdfIn PDF document text
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/firali_gigefe_tufonofi.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/8618063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_6035fe7c08792.pdfIn PDF document text
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/xagowatusizep-wavija-silexufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5fe2bcbf15dbe.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/9dba0b47d8374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff277f863028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fdf9a7e9d7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603bfcf142229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_606acae6da186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_6038587bacd6c.pdfIn PDF document text
    • https://poturipi.weebly.com/uploads/1/3/4/4/134459049/dijalivovabewunu.pdfIn PDF document text
    • https://godewofevi.weebly.com/uploads/1/3/2/8/132814364/faranunomil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6035820e8f012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 5916 bytes
SHA-256: 6e318dcf4e3fe2b5a2ecf477bfbd6b6de548cf01246d0eb025185c71177f28f7
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10432 bytes
SHA-256: c6b4805847ce90a87278d4c14acddcee1f24387cdf8e09dd87eb6c685c736175