Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f070f9ef9e70873…

MALICIOUS

PDF

81.7 KB Created: 2021-03-01 02:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70a75e981bdf2d8fa59ab6b5ef1a0321 SHA-1: d9114ce1cffefe10cb40fd18f0d506257d5a5bab SHA-256: 7f070f9ef9e70873af85bfab54673349c5324521f53a0a12e4a2f53773906b94
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=subaru+ea190v+pressure+washer+hose+size PDF link annotation
    • https://xevogivuzu.weebly.com/uploads/1/3/5/3/135350373/6818252.pdfIn PDF document text
    • http://labiosdewonda.com/playlist_f1_2016nyp35.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/katotelisur_xujevulerotenud_lujukitijozeg.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/85435600808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_6018a299cc7a6.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/61144552797uda53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_603b9270afaee.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/c6cfe91222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_6024ad6f261b9.pdfIn PDF document text
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/sixajonina_belenofagevinu_nalegumuku.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/gudigematumo_kexiropomozi_nuxirovisoj.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/jepazotelazowuwuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5fdec367e7708.pdfIn PDF document text
    • http://4gusevshop.space/gunatinuzelajodexalifu5cc0o.pdfIn PDF document text
    • https://ludilejufa.weebly.com/uploads/1/3/5/3/135347725/3055358.pdfIn PDF document text
    • http://lnstagramsecurity.net/39847652677wb5kf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483608/normal_6004e9e5749a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5364 bytes
SHA-256: c5931b645c74da3d503609d0a5a66b98accc5cfeb5bfde69c50356aae84a090c
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 11152 bytes
SHA-256: 3d1cecd5015416b8d13a766ba5db3e8176772e65b83882afa49d3a3ee4a31df8
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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