Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bd171af98913a0…

MALICIOUS

PDF

90.5 KB Created: 2021-04-07 03:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cc12561f054383ac4f3df4450cbbf24 SHA-1: 1f72aa9a49eb83729ace3e6532384bffe5158c2b SHA-256: 33bd171af98913a0341e7e707677edcb90829e5cd54cf9274c42c9ddfff2421f
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'zajinet.ru', which is likely used to deliver the phishing content. The PDF structure and embedded URI heuristic further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://zajinet.ru/wix?keyword=difference+between+experimental+and+correlational+research
    • https://cdn-cms.f-static.net/uploads/4464303/normal_60356c8880bd3.pdf
    • https://cdn-cms.f-static.net/uploads/4477913/normal_605c6f39dc03f.pdf
    • https://static.s123-cdn-static.com/uploads/4389603/normal_5ff71684736da.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fd33080f04ec.pdf
    • https://static.s123-cdn-static.com/uploads/4371790/normal_5fc6c82559cb7.pdf
    • https://cdn.sqhk.co/delotijuw/ghjgfha/jotexowagozudigorosujamu.pdf
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/jugurafekona.pdf
    • https://cdn.sqhk.co/lexijunibul/hhMeEE0/forme_allonge_en_anglais.pdf
    • http://malegewetepi.22web.org/2710235599.pdf
    • https://cdn-cms.f-static.net/uploads/4476002/normal_60128408bef26.pdf
    • http://ruzoboxilotazex.22web.org/30507610747.pdf
    • https://cdn.sqhk.co/nofoxanu/cSP4hgl/avion_flight_simulator_tm.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_600c7dead03c8.pdf
    • https://numuteje.weebly.com/uploads/1/3/4/6/134683694/muzife-guxizig-tibafegew.pdf
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fed7c4231254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vunefukovamin.rf.gd/book_of_enoch_buy_online.pdf
    • http://dujizadixupodur.epizy.com/statement_of_the_problem_in_thesis_example.pdf
    • http://bedegotix.epizy.com/kakovajiv.pdf
    • http://sejedusodumevu.epizy.com/tofonasufif.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012283.bin
ab3d0c2c0a4c15f99bc6e397aeb8d03075c9f767f25b3162f3cc1121f2acb1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 5692 bytes
font_01_sfnt_off000135ca.bin
6ce28595f355b8564cfd7a4f7d493d95b40e6b045dfc51a753ef103671be26dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 11360 bytes