Malicious PDF — malware analysis report

Static analysis result for SHA-256 f347525e50d4c759…

MALICIOUS

PDF

73.0 KB Created: 2021-03-03 05:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 262b66fa14d69931a737846a116ea19c SHA-1: 2ed1dcd4a2abbbc9b81b3f99f4565faa36832c15 SHA-256: f347525e50d4c759702a47f67a96dc736cdc4273a051acef8f27e2a643e1a696
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous external URIs, with a primary one pointing to 'vilenefex.ru/strik', suggesting it's designed to redirect users to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest it functions as a lure for malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+is+a+dtpa+claim PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476152/normal_6000cccecf37c.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/59470451366.pdfIn PDF document text
    • http://tcerkovniekupola.space/morexowotukqpm7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_601fb00cb1693.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/how_do_i_setup_my_straight_talk_phone_as_a_hotspot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_6016af594944e.pdfIn PDF document text
    • http://redtea.space/rivasajakumulemizemasibxqsf.pdfIn PDF document text
    • http://rubisteq.online/candy_crush_for_mac_laptopljeqq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419628/normal_5ff31d5b30a9c.pdfIn PDF document text
    • http://nominasacra.ru/nfl_live_streaming_apk_for_firestickv4qi3.pdfIn PDF document text
    • http://grenkasalo4.xyz/ihip_bluetooth_speaker_red0jv8q.pdfIn PDF document text
    • http://doordash.fun/53518423468fippz.pdfIn PDF document text
    • http://abwaab.su/6664696140211f73.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/kijelopazekune/fiche_technique_ascenseur_otis.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/heise_notepad_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/zevixonijeki.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/sajudefiz.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/monogram_fonts_embroidery_free.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_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 5232 bytes
SHA-256: 2e7d15da5129e442d1b044d0fad1dd3a5c09a7004bd261e76f8bd277e29df06e
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10388 bytes
SHA-256: 02935e08ec19725296e93c5aeb236fb68b10f62f95cca1c5752eeae5aee90fbf

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