Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b7756dd06176fb…

MALICIOUS

PDF

68.5 KB Created: 2021-04-07 21:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d444f6ad956deee0278ee94611be87 SHA-1: 47b25d44347556c867ee435c5dbad62eaca88829 SHA-256: 87b7756dd06176fb4b57abe2885d6a628b08125626115cfda7cacfc7e02c1602
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, with the first one pointing to 'bologen.ru'. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9402

Heuristics 3

  • 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.
  • 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://bologen.ru/strik?utm_term=how+do+you+program+a+lux+thermostat
    • https://static.s123-cdn-static.com/uploads/4405437/normal_6000955da808c.pdf
    • https://cdn-cms.f-static.net/uploads/4530457/normal_606b56539124f.pdf
    • https://cdn.sqhk.co/jiledexuda/pib5cjh/87881863562.pdf
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5ffad28393739.pdf
    • https://cdn-cms.f-static.net/uploads/4374542/normal_601b42a6253a7.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_6035d273da6d7.pdf
    • https://static.s123-cdn-static.com/uploads/4470688/normal_5ff1c6f16a7e0.pdf
    • https://cdn.sqhk.co/gojelonub/bAgiAif/dice_game_10000_neon_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4428035/normal_60141b2477d95.pdf
    • https://cdn-cms.f-static.net/uploads/4469353/normal_601f0ec0963c0.pdf
    • https://cdn.sqhk.co/liwijodi/dgi5POM/basics_of_computer_science_engineering.pdf
    • https://cdn-cms.f-static.net/uploads/4450719/normal_601de7b81c586.pdf
    • https://cdn-cms.f-static.net/uploads/4455376/normal_6032919c64f30.pdf
    • https://cdn.sqhk.co/zixifazod/FjhQgiS/best_camera_app_for_windows_phone_10.pdf
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5feb716bca9aa.pdf
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/mosoxigapin-renalewelo-zenene.pdf
    • https://cdn-cms.f-static.net/uploads/4406170/normal_60502bf82ccb1.pdf
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/tofuragin.pdf
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/munozorezusibax-nufexagurisow.pdf
    • https://cdn-cms.f-static.net/uploads/4475215/normal_6031257b65ff9.pdf
    • https://cdn.sqhk.co/bilanogakiw/jjhaWDz/kotawaxajemad.pdf
    • https://cdn-cms.f-static.net/uploads/4502721/normal_606a14e30713c.pdf
    • https://dapobatajixafaw.weebly.com/uploads/1/3/4/3/134310280/4043676046.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2bb1521a-7155-4dc3-975e-c7fa0f19d3cc/what_does_criminal_law_definition.pdf
    • https://uploads.strikinglycdn.com/files/fc340566-2c5c-4db5-b329-7d84b8d3d4a7/jitilurumumazajef.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed3.bin
6bab997785a27e0823046e8fff7bebd127501a486cfe8c2d318c388219497c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5596 bytes