Malicious PDF — malware analysis report

Static analysis result for SHA-256 402bf8a2aea2d0c5…

MALICIOUS

PDF

88.0 KB Created: 2021-04-23 22:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5f278eb93a0d903052837cebce4c8941 SHA-1: 2150a09247920d45500f0c8c25f3566e4f80f253 SHA-256: 402bf8a2aea2d0c5a7da5e336ea369c585f09497098d434239c21750f762d356
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is used in the document's apparent pretext of providing search results. The PDF's structure and embedded links suggest it is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://soxebez.ru/strik?utm_term=what+are+examples+of+direct+democracy PDF link annotation
    • http://bejuzoz.iblogger.org/99157704767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409246/normal_5feb4e86f33e7.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/mastering_blockchain_second_edition.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/jazeropiber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_605d8a21cc14a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fc82c53a85a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_600c63f50da57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_606c567ee34ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fe17b1e6c3ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fe982a20ffcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ff62eee6c76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_60519316694c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_60464e6816d0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renirorevebu.epizy.com/the_48_laws_of_power_summary.pdfIn PDF document text
    • http://zaxalamel.rf.gd/boss_telugu_film_songs.pdfIn PDF document text
    • http://kojemerav.epizy.com/business_intelligence_tutorial_espaol.pdfIn PDF document text
    • http://bigoxusu.rf.gd/manuel_de_l_assurance_automobile.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 5580 bytes
SHA-256: f6138dec62d93f2176f76384911ff3ed6d18f9e0d5a2a71612337ebaaa97bda6
font_01_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 11044 bytes
SHA-256: 6c0326b23d743c5108764ad9069ae266130b70bc16d338ad4b99f8990c35a392

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