Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b91a5c414faa82a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-03 15:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b18dfa959c9746a86d959a402ee94081 SHA-1: dbf67a47a50df62e76f4c5809fa8089cf3fa769e SHA-256: 7b91a5c414faa82ac96f28245308bf796749c1c3a89abbdba24bdd67248b64df
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=verbos+irregulares+en+ingles+pasado+presente+futuro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477367/normal_602c9beb3a514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fc747b829877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5feb40622d2fe.pdfIn PDF document text
    • https://cdn.sqhk.co/kivuwutu/aphavvM/66355444825.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/lavajusafatorujeves.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/ijhhcjh/space_battleship_yamato_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/hjichcP/lg_xboom_go_pl5_manual.pdfIn PDF document text
    • http://demask.fun/medical_certificate_form_for_collegey2ur1.pdfIn PDF document text
    • http://goromeo.club/windows_xp_bootable_usb_iso8vafr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_603453b092cb5.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/bgfiiHn/58921678111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritarejameja.epizy.com/29459846808.pdfIn PDF document text
    • http://tulufuparogig.epizy.com/how_to_connect_a_magnavox_universal_remote_to_a_samsung_tv.pdfIn PDF document text
    • http://gudukamu.rf.gd/arcserve_udp_7._0.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_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 5312 bytes
SHA-256: 099dbcf76caaa98fc9c03bb78b526d6caacaaf6e5553492c8ef7e5b44d7b30fd
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 11748 bytes
SHA-256: 49b30e69c4a2f5fd528d8f8b1756afcbafe9d1032248385cbc9309d7488bff1b

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