Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7877f7a857912…

MALICIOUS

PDF

64.3 KB Created: 2021-03-22 03:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7169104662cb89459caf07b3089440e SHA-1: 167a5b8cd8fca62ba7500699b500310e709da648 SHA-256: 4ea7877f7a857912f348923f3452c8e654ac8a90ce10057987c3f5ee4981485e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing the user to 'xezojetit.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable domains for hosting, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=defend+my+nuts+3
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/aa35e.pdf
    • https://cdn.sqhk.co/lefuwaregew/Ugf4Drq/ages_and_stages_se_questionnaire.pdf
    • https://cdn.sqhk.co/takularozo/fhfhalQ/sonic_4_episode_1_apk_mod_obb.pdf
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/fibixosegajeti.pdf
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/banag.pdf
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/83ce5261b4.pdf
    • https://cdn.sqhk.co/bimonabozo/ahaKBlE/snapchat_friend_emojis_theme_ideas.pdf
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/wabaleneke-fofulanuta-xetubinukemodi.pdf
    • http://kawolamekepe.22web.org/35409517792.pdf
    • https://vegivuben.weebly.com/uploads/1/3/4/6/134660922/sigabagibipegigu.pdf
    • http://xufamorazogubov.sportsontheweb.net/18631483393.pdf
    • https://witatike.weebly.com/uploads/1/3/2/3/132302928/purivafuk.pdf
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/2427992.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://midetawedafete.epizy.com/zekakowawabopufugixip.pdf
    • http://davupuvaf.rf.gd/applied_artificial_intelligence.pdf
    • http://vobogiv.rf.gd/55636845327.pdf
    • http://movuzawizigevej.myartsonline.com/auditing_notes_free_download.pdf
    • http://tatesit.myartsonline.com/47523662079.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11e.bin
b3df47d39cde86899d2714fb17071595aa3e186fcd1a44683b535b7d9b812478		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 4980 bytes
font_01_sfnt_off0000d21c.bin
3fbc0526ec5c6490d219ff5a2044f8644d993028ac63e6e25114c43f52142cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 9992 bytes

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