Malicious PDF — malware analysis report

Static analysis result for SHA-256 a589b0cd59ef99ff…

MALICIOUS

PDF

75.9 KB Created: 2021-02-23 17:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 04bebf31916c829f4e7b8429feee15b8 SHA-1: da3b622d87ce8484a2b2e1a187eb06f7150223e1 SHA-256: a589b0cd59ef99ff19ad4e161826cb9a14149003a56681295be77dd7608b9b90
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous disposable URLs. The document body, though obfuscated, contains keywords like 'Siemens logo plc manual pdf' suggesting a lure. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bologen.ru/123?utm_term=siemens+logo+plc+manual+pdf PDF link annotation
    • http://mosdendy.store/zubolusagesalawimedunab5ur2r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5ff04bbfaca2e.pdfIn PDF document text
    • http://dasuwupozu.22web.org/56917389126.pdfIn PDF document text
    • http://lavkavkusa.store/nibofevasidolatok2cpa0.pdfIn PDF document text
    • http://pixekabafan.iblogger.org/a_discovery_of_witches_season_2_episode_1_release_date.pdfIn PDF document text
    • http://sportita.fun/how_to_draw_anime_curly_hair_male9wgba.pdfIn PDF document text
    • http://tiktokhd.design/ruluxuxifafewutirumuvexof1y7h6.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/mujawiru/thDhjie/football_manager_brazilian_team_names_list.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/igbjjib/58600552772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fed2d7f8dd6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://musowafotoxipid.epizy.com/django_render_jinja2_template.pdfIn PDF document text
    • http://woxozizelisudu.epizy.com/bts_world_ost_album_zip.pdfIn macro / runtime command snippet
    • http://kurivixudenetiw.epizy.com/38830438440.pdfIn PDF document text
    • http://najefitisefema.epizy.com/fepebujafijodafitolam.pdfIn PDF document text
    • http://xazexunipix.epizy.com/plant_and_animal_cell_worksheet_answers.pdfIn PDF document text
    • http://sedobuxekazadi.rf.gd/uefa_champions_league_2019_games.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/leisure_time_in_america_ielts_reading_answers.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://musowafotoxipid.epizy.com/djIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 5480 bytes
SHA-256: 298fcbfef7a0a1939ef80477346c97161056d4d3e498f67ef38beac8f674986d
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10600 bytes
SHA-256: d7b3fe5fd40327ee8157d06e1f70f4c96038b498aff558904375b200fa684e4e

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