Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bae4a251b14157…

MALICIOUS

PDF

84.0 KB Created: 2021-04-22 01:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a966369a1ded3b683a64701ab2a2a661 SHA-1: ed464356c419e11a8d7a5594f7e04736e29aac5f SHA-256: 27bae4a251b14157d5666c07ed5ad1d822ee08155d231a30b52b8f683f2b452d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detection identifies it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the nature of the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=crusader+kings+2+agot+mod+traits PDF link annotation
    • https://cdn.sqhk.co/tarudifirew/UCgcJ8h/gamecube_smash_bros_melee_trophies.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/aXhisIz/mango_green_tea_bubble_tea_calories.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/how_did_thomas_merton_die.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_605f92c86f960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fe8a72654d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601f9a98098ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446162/normal_5ffb119363c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5ff4b191f03b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_6067eb46e25b8.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/defaxejagib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_602a3f6dd424a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_6054848e51778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_602b254421d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_601c8777e452f.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/IjdjgbO/gravitrax_marble_run_starter_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496378/normal_5fdbed81327fe.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/how_to_use_a_simple_sewing_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_60527e5d662f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff470c37e8c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/mufixawode.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/kajoxamivipazegowov.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/is_the_flower_of_life_biblical.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/what_grade_level_are_the_hardy_boy_books.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_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 5212 bytes
SHA-256: 6459acb442990565aab8b09ee6d4f5677f45c08e7cb2e4ee0f18ff3f6fa750d6
font_01_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 12344 bytes
SHA-256: 888e569918aa99597ea9c7e877d58caec051f939bc2654eca7df5c90d06ef930

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