Malicious PDF — malware analysis report

Static analysis result for SHA-256 33af74d5a188cc02…

MALICIOUS

PDF

61.8 KB Created: 2021-03-04 10:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 78ab0bb3d39005ad3c78753ea63d99ca SHA-1: 60aea0f8da824f8245059ff645ba7e2b577c3fc8 SHA-256: 33af74d5a188cc0265c793bb4de13f57ada94de1b9ee1590911d813f41af8659
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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=automobile+dealership+business+plan PDF link annotation
    • http://arm-watch1.club/zepuwupobusajotapirur2k0c8.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/7hb2YOV/iced_matcha_green_tea_latte_has_caffeine.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/n2Ghdij/gravity_movie_trailer_2013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379606/normal_5ffa7f6984b1d.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/cdggGLS/tonabamibo.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/hijfihD/pokemon_sword_hitmonlee_evolution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_601124db6c30a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_6000f322763ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5feaf7a341480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5fe51d919289c.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/icxjzqo/what_time_do_dodgers_game_end.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/fSNigjg/mod_game_family_zoo_the_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidufapikefufeb.epizy.com/river_flows_in_you_piano_roblox_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/divojivawosumoxakerujinen.pdfIn PDF document text
    • http://pifimopumo.rf.gd/falojebigilokisal.pdfIn PDF document text
    • http://vudamup.rf.gd/kindergarten_cop_2_imdb_parents_guide.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 5328 bytes
SHA-256: ce372ad915ba0483d3bbc238277dfa34eca990f9e4e25627d7d80174e6b1a14f