Malicious PDF — malware analysis report

Static analysis result for SHA-256 305f93922c13b8b2…

MALICIOUS

PDF

77.7 KB Created: 2021-05-11 06:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 633a53372af77e274cb06c7a8aa91e6a SHA-1: 9081fdcb0e59f43e3ed7aa98bf771a02c7c11ecc SHA-256: 305f93922c13b8b2c1e3fcfa0530a3f13485bd5e59243ccecfbb8c525e689620
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware delivery. The document's metadata and structure suggest it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=business+communication+articles+pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6037c8344390a.pdf
    • https://cdn.sqhk.co/zotenejek/hWieGlG/fosasupivifazatitan.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5fd6f7f9b017e.pdf
    • https://static.s123-cdn-static.com/uploads/4482858/normal_60075dd78fe72.pdf
    • https://static.s123-cdn-static.com/uploads/4443576/normal_60083c072b1bf.pdf
    • https://cdn.sqhk.co/zobelekivix/E9gd0VL/39491550028.pdf
    • https://cdn.sqhk.co/sonawumi/idhhBgh/dosenatemedufo.pdf
    • https://cdn.sqhk.co/dusawugivepo/cihhOhc/80649058915.pdf
    • http://sanegofelofut.22web.org/bapubesalavus.pdf
    • http://remont-kholodilnikov.website/gexuxejusironedn9a.pdf
    • https://cdn.sqhk.co/xiwasazafu/w3idhbV/classic_hearts_card_game_download.pdf
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5ff06b4bce5d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_efbd3a72e09f4c189b4a4eda52385c19.pdf?index=true
    • http://nofaramubibuv.epizy.com/viva_vaia_augusto_de_campos.pdf
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_bed3d4c72b9243e78c7e66e110cda9f7.pdf?index=true
    • http://bofagobun.rf.gd/62129718157.pdf
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_ca0e0a378e5e40e58b69f19dcbba01c5.pdf?index=true
    • http://divojeniro.epizy.com/financial_report_example_excel.pdf
    • http://jafufalabo.rf.gd/bob_ong_books_download.pdf
    • http://jezagap.epizy.com/clear_system_cache_android_s4.pdf
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_1740297dd2ee4089b519b0c7d5b1e58f.pdf?index=true
    • http://fobiwuna.epizy.com/65008867022.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_e927677c342f46a6b967401627b045c0.pdf?index=true
    • 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_off0000f3c2.bin
5ca2a8e5fccb9a752f0cfadbf5832d1c2686e73a88646c86ca1a597eea4d96bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 5348 bytes
font_01_sfnt_off000105da.bin
dfe1bbefa155e26adabc4f082dcc33cb11d541e40719631f04c5d0540556928e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10308 bytes

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