Malicious PDF — malware analysis report

Static analysis result for SHA-256 645e79c48e61d4bb…

MALICIOUS

PDF

65.1 KB Created: 2021-06-01 13:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ccc13a28f0dadeea851daff36153f4b SHA-1: dbf0a36499471d1833493b2ad1c9e6fe489f939c SHA-256: 645e79c48e61d4bb23f5749df3c517de5fea466b04921b2396655e3fd989f1a6
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6944

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nomylo.ru/pbw?utm_term=diccionario+de+sinonimos+y+antonimos+en+ingles+y+espa%25C3%25B1ol
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6041cc41726b2.pdf
    • https://jobexevufurol.weebly.com/uploads/1/3/4/5/134526996/mejuro.pdf
    • https://cdn-cms.f-static.net/uploads/4393647/normal_6069f5f8ce920.pdf
    • https://satutetijin.weebly.com/uploads/1/3/4/6/134635437/bodotekinobolevu.pdf
    • https://static.s123-cdn-static.com/uploads/4504554/normal_60086b1fc7124.pdf
    • https://cdn-cms.f-static.net/uploads/4427538/normal_6063a0593b999.pdf
    • https://rexuxoxef.weebly.com/uploads/1/3/4/0/134018301/4849b231c6.pdf
    • https://cdn-cms.f-static.net/uploads/4462379/normal_6033caea7167a.pdf
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/1672410.pdf
    • https://static.s123-cdn-static.com/uploads/4379612/normal_5ff3a0bd3f228.pdf
    • https://cdn-cms.f-static.net/uploads/4461219/normal_6018b25cc4a5e.pdf
    • https://cdn-cms.f-static.net/uploads/4447906/normal_605b92a530fed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a187796c-4482-4bfa-bb73-8d4f5f07765b/wouxun_kg-uv3d_unlock_frequency.pdf
    • http://serizedez.pbworks.com/f/how_do_you_treat_coliform_bacteria.pdf
    • https://uploads.strikinglycdn.com/files/51482bf4-fd3c-421c-8ddd-83bfa3562d3c/browning_hi_power_pistol_review.pdf
    • https://uploads.strikinglycdn.com/files/6b551317-22e2-437f-bf01-f27bc09457fd/como_se_produce_el_arroz_en_colombia.pdf
    • http://zikupuzajix.pbworks.com/f/92328094771.pdf
    • https://uploads.strikinglycdn.com/files/388c4640-3909-4848-b4ae-793dc9cfd185/cuanto_es_1_metro_en_pulgadas.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c360.bin
a258ee33439ad055d2e9710f8900a7d57bcce5705aa460b0316c1b1184561557
pdf-font-stream PDF embedded font (sfnt) at offset 0xC360 5492 bytes
font_01_sfnt_off0000d5b9.bin
c0996a3eb96fb42179f87b1d50a3cdc4058a064da6d464f764f0c5c69aecb64a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 11196 bytes
font_02_sfnt_off0000f9db.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 4324 bytes