Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7e3236c25749de…

MALICIOUS

PDF

92.7 KB Created: 2021-02-21 11:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 634d81b9c4deb386faa92843e8eafe01 SHA-1: 39d6e01e50ba47437fe367ca0f45ce089a9cf892 SHA-256: bf7e3236c25749de058de5fc08b73217f23def634d65466fc8e551157d70ab38
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, https://baarspo.ru/strik, is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=un+mundo+feliz+resumen+por+cap%25C3%25ADtulos
    • https://cdn.sqhk.co/noperizapewo/ggcIibu/korivokipazasekerit.pdf
    • https://cdn.sqhk.co/fipimomozuk/j9gi5gd/auctiontime_app_apple.pdf
    • https://xizavuxovom.weebly.com/uploads/1/3/3/9/133986710/tipibuvol.pdf
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6024a1324d930.pdf
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/4687384.pdf
    • https://cdn-cms.f-static.net/uploads/4388173/normal_6024a78a202e3.pdf
    • https://cdn.sqhk.co/jimumakevaji/highfij/mudding_spa_cost.pdf
    • https://cdn.sqhk.co/fumodolanes/dUXicrH/bewomuwutolivej.pdf
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/tasotofukam.pdf
    • https://wejilosadala.weebly.com/uploads/1/3/0/8/130815097/ac1d09ca.pdf
    • https://cdn.sqhk.co/dinigivo/aingfhj/60691366790.pdf
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/9913464.pdf
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/3898562.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vanomuwoz.epizy.com/tv_guide_usa_fox.pdf
    • http://tefabawamibane.epizy.com/fapasarobesomakub.pdf
    • http://suziben.rf.gd/nukiwima.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e2c.bin
9eecdf5073d667e6631557c7d74f250cc8f8395fd268b25764df988d689dc1ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 5280 bytes
font_01_sfnt_off0001300a.bin
d76a07bcf22d079a2e24513d6303330d33a3b5304c0e96466591a63457238c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 11488 bytes
font_02_sfnt_off00015523.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x15523 4324 bytes