Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b1e261a83f967…

MALICIOUS

PDF

91.1 KB Created: 2021-04-09 00:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ad1f5fc28fadfbe4c8390dd53d539e SHA-1: d677953e611aa935e44ec24c4d5f2c0239f08e4d SHA-256: 3a3b1e261a83f967bd74cb4bd47cfe1747d19441e597f4112fb6fcfd290bccb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one suspicious URL pointing to 'vilenefex.ru'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to direct users to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=what+is+the+meaning+of+the+complete+metamorphosis
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/6341314.pdf
    • https://cdn-cms.f-static.net/uploads/4457862/normal_600bbf35227d3.pdf
    • https://bokozadag.weebly.com/uploads/1/3/0/9/130969835/1353553.pdf
    • http://qiwi-wallet.online/kujipatefatuseticu7j1.pdf
    • http://ponemofetu.scienceontheweb.net/95000168664.pdf
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/gijikogavawofej-wemenenum.pdf
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5fe371e6604fd.pdf
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/7330165.pdf
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6013a2211b734.pdf
    • http://sait-ok.ru/my_hp_envy_will_not_print_blacke2w2v.pdf
    • http://kitukotobov.medianewsonline.com/tikofururinuvoti.pdf
    • https://cdn-cms.f-static.net/uploads/4391623/normal_60412ddbbf0f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/baa777d3-dbf4-4ce7-9928-294e5b239faa/the_mortal_instruments_movie_jace_and_clary.pdf
    • https://uploads.strikinglycdn.com/files/482cb7f2-7e99-49d1-bf7b-c920340f1ae7/beats_studio_3_replacement_ear_pads_apple.pdf
    • https://uploads.strikinglycdn.com/files/38d711b4-ba89-4a74-b216-b03237700d49/where_to_learn_wing_chun_near_me.pdf
    • https://uploads.strikinglycdn.com/files/606d3d0e-fd9d-4479-86f4-0eabd3af1e5b/dosage_calculation_practice_problems_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/74c7c449-1db7-47be-abdc-4af889bc8682/gemeb.pdf
    • https://uploads.strikinglycdn.com/files/97d08a1e-d3fa-41db-abfb-4089d82d8f55/34384451939.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff52.bin
e353e6313a24fb3c9a58326dfe9606e1da99e50def168bafb85e8f7649ba62b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 5232 bytes
font_01_sfnt_off000110fc.bin
1211d1e671e24c56771367b9684839d3cc2a7959681be8495db3b4aeeec87464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 13052 bytes
font_02_sfnt_off00013bce.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 16060 bytes
font_03_sfnt_off00015065.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 4324 bytes

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