Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a9f1a243e1ee2e…

MALICIOUS

PDF

74.6 KB Created: 2021-02-26 11:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5a5591864fe5ed92054fda712249e514 SHA-1: 2234286c0f6df9795cf2dbb85d9d9dbb3e0f91dc SHA-256: 61a9f1a243e1ee2eb25c5b3bd5c126a152d6920717ff36d4f18fb483eed1d8e8
266 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a social engineering attack, specifically a 'ClickFix' lure, by instructing the user to interact with the clipboard and execute commands. The document contains numerous external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://kuzutuzo.ru/123?utm_term=dymo+labelwriter+4xl+out+of+paper+error PDF link annotation
    • https://cdn.sqhk.co/puvegipuros/GyfidTx/events_near_me_on_october_7.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/gopuwirakerojoso.pdfIn PDF document text
    • https://miletobe.weebly.com/uploads/1/3/4/8/134860907/bixonikufu.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/2772468.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/3a46djc/strategic_marketing_planning_process_begins_with.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/bgcIF5G/79835947492.pdfIn PDF document text
    • http://uablog.site/final_fantasy_iv_the_after_years_psp_guiae9dyz.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/7597188.pdfIn PDF document text
    • http://fbdirect.site/donesidowamovowupiwez07kj.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/5hcQihS/ninja_samurai_assassin_hero_5_mod_apk_download.pdfIn PDF document text
    • http://atlas-copco.su/tunivumemibedeximuguv0o3mu.pdfIn PDF document text
    • http://aduo5.online/dibujos_con_triangulos_facilesoyu5s.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/7521695.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/eiegfhf/nbc_sports_app_authentication_error_xfinity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 5356 bytes
SHA-256: c4dd1d97037fb08112ae620498bcc1d1569c568db1dfb30ab212025087ead266
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 9956 bytes
SHA-256: 5b328595ccfb5a4b4f67e8b27ea5973b6aa64b517b8b1a0f7dd05bedbcd92cc7

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