Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d248fc51bd7f21…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 19:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 607141a6680e552e0cba97bfb48a700c SHA-1: df9ead9d2f1a8aa9e4cda381258671f2cfa42991 SHA-256: d7d248fc51bd7f21592a3c97f62b80a4dd0c51b6d2b617e9586f77b414ffc77f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites, potentially for phishing or malware distribution. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://bologen.ru/strik?utm_term=broan+range+hood+parts+switch+replacement PDF link annotation
    • http://copyrighthelpptteam.com/51743534588rrrw0.pdfIn PDF document text
    • http://instapriz365.online/sultan_the_game_mod_apk_revdl1spiq.pdfIn PDF document text
    • http://dimax.website/1939252025e7k4a.pdfIn PDF document text
    • http://aicberg.net/girona_self_guided_cyclingjimqx.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/ae283ef2cd93.pdfIn PDF document text
    • http://mijudivoxobo.iblogger.org/97965440062.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/9702018.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/74a0ab.pdfIn PDF document text
    • http://natlab.ru/fundamentals_of_database_systems_solution_manual678y4.pdfIn PDF document text
    • http://greyfruit.space/total_war_three_kingdoms_guide_economywitok.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/tobaziw/pepevitexarumaku.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/nupebi.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/86840677132.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/faberezopezex.pdfIn PDF document text
    • http://nivemegasewokem.rf.gd/basic_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/56842184909.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/hey_there_delilah_sheet_music_piano.pdfIn PDF document text
    • http://xunevonobi.epizy.com/kibekotapuwawopuzezod.pdfIn PDF document text
    • http://sopazanit.rf.gd/rizudumakik.pdfIn PDF document text
    • http://sugexure.rf.gd/halloween_worksheets_for_kids.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 5628 bytes
SHA-256: 4f3548f6b38908e43d17996e46df448b075fe8257e225a8b1c9fe044c8f83d5a
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10296 bytes
SHA-256: 8ea73e3c2d57ae741774c0ba7f115c27b6c95e6708268540f5d3dcdf87749cdd

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