Malicious PDF — malware analysis report

Static analysis result for SHA-256 655d8162d9404208…

MALICIOUS

PDF

86.7 KB Created: 2021-03-24 04:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff217ad01b3085a0ce24761f4f5635e SHA-1: 28474f15796eb09340b1ae28c7a8f36a5accba72 SHA-256: 655d8162d9404208487aca5383c4781b38471ea6ba1bb665881c0d534cbfd72e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary URLs points to 'vilenefex.ru', suggesting a potential phishing or malicious content hosting site. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to directing users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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/123?utm_term=chinese+landscape+wallpapers
    • https://static.s123-cdn-static.com/uploads/4372073/normal_5fded7a16f606.pdf
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5fd32a01e2ef3.pdf
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fd2740658006.pdf
    • https://cdn-cms.f-static.net/uploads/4387718/normal_6032758f62f84.pdf
    • https://cdn-cms.f-static.net/uploads/4470543/normal_604a4baac6bf3.pdf
    • http://kitapusowa.22web.org/zipev.pdf
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5feb044e6b6d9.pdf
    • https://cdn-cms.f-static.net/uploads/4451742/normal_6031748ad85f9.pdf
    • https://cdn-cms.f-static.net/uploads/4382966/normal_60171dacdd176.pdf
    • http://jejepofat.22web.org/21911329087.pdf
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fe2bd9dbdd61.pdf
    • https://static.s123-cdn-static.com/uploads/4456121/normal_600798f44d295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zuvadawodazedig.epizy.com/rebuild_air_cooled_vw_engines_hp_255.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/18084789816.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_3eb6704cc9d44b089c6b5158b08fef7f.pdf?index=true
    • https://s3.amazonaws.com/genedesowul/tonopabemitoxuvapoduvo.pdf
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_f2bd55719c044a79b9734dc35f706072.pdf?index=true
    • https://s3.amazonaws.com/nefomojuwet/godot_animation_player_sprite_sheet.pdf
    • https://s3.amazonaws.com/mupukesunobaga/vikeridojofegizetoxaxotud.pdf
    • https://s3.amazonaws.com/pulavokaxe/amelia_bedelia_goes_camping_guided_reading_level.pdf
    • http://kodubinajanefuw.rf.gd/caruso_josh_groban.pdf
    • http://wixufoliwesomep.epizy.com/shirt_template_design.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e868.bin
1464a5b05408eedb77fda2fed5aeb93f4feaae0dab0e881434b1fdf11b68517f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 4872 bytes
font_01_sfnt_off0000f8e2.bin
76eac47697ee67078b587b2821bca7042e2c0290ac5c597e9a389399678f7643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 1728 bytes
font_02_sfnt_off0001017d.bin
dd99d47c2f050ed4fea3518da11db53823d4895ba0d767485839824a21a2f31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11344 bytes
font_03_sfnt_off000128ac.bin
0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16164 bytes
font_04_sfnt_off00013da6.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA6 4324 bytes

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