Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d6e6041913bbe1…

MALICIOUS

PDF

71.8 KB Created: 2021-03-10 21:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb4724e9e691b9fe2d43622fe5ca26f SHA-1: 7dacd314859ea9bb3a6eab07dff515405e00808e SHA-256: e3d6e6041913bbe1e46c993d0e1d088831a6f4dcdfedcc0911cdbf6ae8ced413
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded external URIs. The document body, though heavily obfuscated, suggests a lure related to a 'business email writing course' and contains metadata from wkhtmltopdf, indicating it was likely generated from web content. The presence of numerous embedded URLs, many of which are suspicious, points towards a phishing or credential harvesting attempt, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=business+email+writing+course+pdf
    • http://kusafomidufe.mywebcommunity.org/divina_commedia_inferno_canto_v_parafrasi.pdf
    • http://hugertely.xyz/kawozebok23z.pdf
    • http://banademebilite.sportsontheweb.net/work_and_power_practice_problems_answers.pdf
    • https://cdn.sqhk.co/kewusikata/hfgcKje/xopujovumofixoziru.pdf
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd642958265f.pdf
    • http://nijalatol.mypressonline.com/73270087146.pdf
    • https://cdn.sqhk.co/gadukupuwe/jd7Kij8/jegosub.pdf
    • http://mavito.online/mathematics_worksheets_for_grade_6ovikr.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_6047d13034314.pdf
    • http://heliusdesign.ru/mhw_investigation_farming9n2bn.pdf
    • https://cdn-cms.f-static.net/uploads/4419847/normal_602ec3abb276d.pdf
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/9221bc.pdf
    • https://cdn.sqhk.co/gojinuma/d34geji/picrew_avatar_maker_male.pdf
    • https://cdn-cms.f-static.net/uploads/4454041/normal_601ca1b4a0ae9.pdf
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/nemudewi.pdf
    • https://cdn.sqhk.co/luwiwaduna/VJrT7YQ/dungeon_defenders_2_defense_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gafodix.myartsonline.com/xinisojusakomagotolugo.pdf
    • http://xujided.onlinewebshop.net/the_things_they_carried_quotes_about_kiowas_death.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_off0000dd2f.bin
3e44a561e88c25d12944adf940e4277726a750c04d90024c6cd2fbd6bfb17749
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 5616 bytes
font_01_sfnt_off0000f041.bin
ca867eceb1826dd69a7c07f376086c6611f2fd67ae8f13f69ac16c711c5972c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 9876 bytes