Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f60dbf4a547895…

MALICIOUS

PDF

73.5 KB Created: 2021-04-16 09:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1fbbf360458391140d52b0513e96e8b3 SHA-1: 331a6acdc47c30dac39b1dfdc8c52982001a6047 SHA-256: f4f60dbf4a547895463cd2e39a4c2769ae3be2b0184b051238df0c0d8c300d35
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'mezovuduw.ru', which is likely used for phishing or to download a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to job opportunities, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=senior+business+analyst+jobs+melbourne PDF link annotation
    • http://liko-sneakers.com/planeta_dos_macacos_o_confronto_resumo1dkqo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_604bb2d362b31.pdfIn PDF document text
    • http://profaudit32.ru/109510447190thz3.pdfIn PDF document text
    • http://arenda-comp.space/mission_mangal_full_movie_magnet_linkwh0iu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5fd3319f0fe1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495536/normal_603eb307d55a8.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/68987051303.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/wafevukosogiloganupido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_605ab80713096.pdfIn PDF document text
    • http://numulul.mygamesonline.org/89240241602.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/tirirafusejavesubokowutep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_6015adf548ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_605996d475de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_6052abc51850a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_601d305ab6d45.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/cuisinart_custom_14_cup_food_processor_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazaburifug.myartsonline.com/dagejova.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/definition_of_business_research.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/games_to_play_on_zoom_with_first_grade_students.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/dungeon_defenders_awakened_alchemical_laboratory_survival_guide.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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5252 bytes
SHA-256: c8de05d489d8ff225ccf8b09766895c87ea9ea17c1922f9f4fa571c5d50f41f9
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10860 bytes
SHA-256: b7d58b6cfa1546f9b5e6c83ece7279029c46db04b3265c72e17f74d1920e0139

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