Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef6d9a1358d2d8b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 07:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7920093f5f74c088cb8c6851ede8a1f SHA-1: cd8deac322422df13fe80276bb8640e4e51d288f SHA-256: 1ef6d9a1358d2d8bea23c7e603cd6f1c70b39230880a84134b1e8dba88dcd28c
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://leonvi.ru/award?keyword=balantidiasis+adalah+pdf
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fccd4244e02f.pdf
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/pixibajawet-jivoveju.pdf
    • http://xokezuwadem.mygamesonline.org/ableton_keyboard_shortcuts.pdf
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/4865041.pdf
    • https://cdn-cms.f-static.net/uploads/4366949/normal_604cc237418e2.pdf
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/gumibudixetel_futogemizo.pdf
    • https://cdn-cms.f-static.net/uploads/4414169/normal_602d0ede76abd.pdf
    • http://jabewes.medianewsonline.com/82803338014.pdf
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/ef99e965146.pdf
    • https://pusojavinobaz.weebly.com/uploads/1/3/4/3/134353251/f6281.pdf
    • https://static.s123-cdn-static.com/uploads/4424013/normal_5feb003ddf406.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d04b3a41-ff17-4eed-adab-92eb0c49491c/systems_engineering_salary_uk.pdf
    • https://uploads.strikinglycdn.com/files/2d770e9a-2790-4eb6-9362-e43915a4dcac/83490470416.pdf
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_de8f4f0edb4a4b8d8ab72cc46b13e8d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d258b26a-6be0-4555-9644-3ac305ca494f/rovilanumukojob.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_87f0b6ce83994f75b225ba27d8b924e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e37935e-6206-4d79-9042-607719ab143c/lugirokivakivozuwobagamo.pdf
    • https://uploads.strikinglycdn.com/files/2cce6f05-abdf-4dd6-9d0c-66a0af32ee9b/3794619934.pdf
    • https://uploads.strikinglycdn.com/files/6c577192-f17d-4112-97d1-96e42c7313fa/52900138581.pdf
    • https://uploads.strikinglycdn.com/files/98d893ae-b790-463f-b1ee-a4ed6e24f306/pixie_plus_sewing_machine_bobbin_case.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_856e0f2c49014399acaa27eb426c2517.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a1.bin
d6930a1e8335e24222c5c59fc78c35ad3e8e0774c7600b2c94da090e3d25694c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 5080 bytes
font_01_sfnt_off00010aea.bin
f7ec73fd3b56cda5da5949d92f62f0ba216fb301c7f9d9869cf926e07982df91
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 11432 bytes