Malicious PDF — malware analysis report

Static analysis result for SHA-256 047751ef0855f316…

MALICIOUS

PDF

69.7 KB Created: 2021-01-26 06:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1b01f483ebd31fb18864b14291f26626 SHA-1: 95d91f1f3dfa45f432a0569d1e7b5b1828a50e4c SHA-256: 047751ef0855f3163cd22549b137c058e9bead228abb79b9f479a96415157495
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links pointing to disposable domains, a common tactic for SEO spam or phishing. Heuristics indicate a link farm structure, and ClamAV detection confirms malicious intent. The ML classifier also strongly flagged this PDF as malicious, suggesting it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=is+mount+everest+one+of+the+seven+wonders+of+the+world PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fd03e30c209a.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/qEkichf/59434080460.pdfIn PDF document text
    • https://cdn.sqhk.co/xabovalizo/gdjiiWQ/tempest_pirate_action_rpg_free_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/jbih6xd/gunnersaurus_salary_at_arsenal.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/rnjbhiJ/vozopabelupad.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/5432610.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/id0jffm/742844358.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/dhdifid/tobujagololesorekazalado.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/33i5E4e/define_labyrinthine_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/99hgjiM/kibawew.pdfIn PDF document text
    • http://universityru.fun/congo_minerals_mapq5mgn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegukamadoso.epizy.com/53108853179.pdfIn PDF document text
    • http://lojizaruxaz.rf.gd/chaska_red_farari_ka_song_pagalworld.pdfIn PDF document text
    • http://lenixad.epizy.com/athlean-_x_max_size.pdfIn PDF document text
    • http://kipirigup.rf.gd/vimeo_video_file_format.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_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 5024 bytes
SHA-256: 205c2417d1675539519644f47d8a5315c9eeabd0758b8f88176cacf7195e2fa3
font_01_sfnt_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 10596 bytes
SHA-256: e0556c27b21e4f2d64c219132bbd420dea7c71f0729d8c9022026962a2aef9a6