Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3595592eebd51cb…

MALICIOUS

PDF

87.2 KB Created: 2021-04-07 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 120eb47f03683dc96ef3a6ca226b32bf SHA-1: 2e4a455ddd189cdfccbf56a0b44bbc935351c3f3 SHA-256: e3595592eebd51cbf5a8fe6f3fb137f76a5624ec66b29bccc2535bae325a0b7b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links suggests a link farm or redirection strategy, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://vilenefex.ru/123?utm_term=tutorial+filmora+9+indonesia+pdf
    • http://idealica-italiaufficiale.site/tanatologia_veterinaria10yk1.pdf
    • http://znakomstva69.space/the_kite_runner_essay_father_son_relationshipc048x.pdf
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/fodugijusidolekofubu.pdf
    • http://flowerport.market/lipegu4jsvt.pdf
    • http://maykistore.ru/long_john_silvers_menu_nutrition_information6pv7s.pdf
    • http://heretythere.site/fractions_worksheets_year_35pdit.pdf
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/2943348.pdf
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/gusabevipudaw.pdf
    • http://bcipreactivaperu.com/hrw_math_online_textbook_answersb5ym6.pdf
    • http://liketsven.xyz/napotlufgt.pdf
    • https://davugewozo.weebly.com/uploads/1/3/1/4/131408984/7399195.pdf
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/zekuvabev_volil.pdf
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fc716106e38b.pdf
    • http://theharaka.online/accellion_secure_file_transfer_user_guide7hk3w.pdf
    • https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/47c4b4413d626.pdf
    • http://legiontry.online/balakalosopetaxubinojubgufhn.pdf
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/vefofajof.pdf
    • http://copyrightnotices-form.com/wugufajabeniwo1adt3.pdf
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6028a05a8868e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010202.bin
ae37551774c65823ee7e41537ec76efacd7e5fa48e7e0a143d4a3550f38cf051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 5292 bytes
font_01_sfnt_off000113e5.bin
aa8227459808f58237815e637e4eac6eb605dca1885c4569fbc3b66b4fa876a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 10300 bytes
font_02_sfnt_off0001376e.bin
e95f0b2d881bd597b835feb77e991faed11443657346828a33bb43f7616f7a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16460 bytes

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