Malicious PDF — malware analysis report

Static analysis result for SHA-256 45515584fdd0d26b…

MALICIOUS

PDF

71.2 KB Created: 2021-02-27 05:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d38b3ed45d7a85887b45c99e80c96e8f SHA-1: c26fb841b82b6e335ab478fc47729f90241ca928 SHA-256: 45515584fdd0d26b12ee8fa502abe721960afad248fa054eb11bf00fe345c23e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the nature of the redirector suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=free+willy+4+trailer In PDF document text
    • http://raisinshq.club/5307191676051r20.pdfIn PDF document text
    • http://hurleyshamburgers.com/frases_del_libro_monje_que_vendio_su_ferrari66a7x.pdfIn PDF document text
    • http://bonboxstudio.com/kuwidepofirerugslqvl.pdfIn PDF document text
    • http://retys.space/can_you_ship_usps_from_home72xc7.pdfIn PDF document text
    • http://liketime.fun/dot_corrective_action_plan_templateeo4t6.pdfIn PDF document text
    • http://nutristrike-shop.ru/wufibepofobegaf7k5hr.pdfIn PDF document text
    • http://grenkasalo4.xyz/traducir_de_espaol_al_ingles_britanicopbkqx.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/vapixekelufiwow.pdfIn PDF document text
    • http://zupubovogigu.iblogger.org/what_is_the_mood_in_the_beginning_of_the_monkeys_paw.pdfIn PDF document text
    • http://hargotel.xyz/31831852148kncss.pdfIn PDF document text
    • http://converstarget.ru/silunuwuloberoxu4gobl.pdfIn PDF document text
    • http://rmk4sale.xyz/channel_master_9521a_antenna_rotatorxk2f0.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/dezajok/27265017105.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/joweriva.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/21390942044.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/2019_assamese_video_song.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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 4740 bytes
SHA-256: 22678e3b6fd16e2b505f9881ab3bacd0c61463cbaaa5dd90fa18011964a0918c
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10612 bytes
SHA-256: 4b63eb4ddc3a79a174e8992370f3591e20e8f9661f2f1c0fed99aaff65da19b2

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