Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e25db66bf9f8b99…

MALICIOUS

PDF

81.9 KB Created: 2021-03-16 20:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e4be0bc3ab32633fec6f85d70f073b2 SHA-1: a13bfa7821c1a4bc32ed55a05dadb369424e6ea4 SHA-256: 5e25db66bf9f8b99b4813c663e42234f258e28e1047bfde7b97d188a51a431e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful websites, such as the one found at zajinet.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=low+carb+keto+diet+plan+for+weight+loss
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/nolegunisopuwep-rusalibugowabes-xewalapo-sirokevubanawu.pdf
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/3379909.pdf
    • http://dotenipago.medianewsonline.com/75762164312.pdf
    • http://lifolibi.sportsontheweb.net/disney_world_opening_hours_february_2020.pdf
    • http://xazixovabifin.medianewsonline.com/light_reflection_and_refraction_class_10_notes_ncert.pdf
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/80d7e4.pdf
    • http://vazewuxu.mywebcommunity.org/anamnesis_que_es.pdf
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/5023612.pdf
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/wafalepep.pdf
    • https://satijezusadevu.weebly.com/uploads/1/3/4/3/134310115/5871896.pdf
    • http://tusiteguluvora.getenjoyment.net/beats_solo_3_vs_studio_3_vs_pro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozoxub/aircraft_maintenance_manual_airbus_a320.pdf
    • https://s3.amazonaws.com/pasawexawinogad/occupations_vocabulary_exercises_worksheets.pdf
    • https://s3.amazonaws.com/tapexiw/77269013421.pdf
    • http://zudupaxub.myartsonline.com/is_the_boy_who_harnessed_the_wind_nonfiction.pdf
    • https://s3.amazonaws.com/gezizefefififa/reset_transfer_belt_samsung_c460.pdf
    • https://s3.amazonaws.com/xuvamuba/37292093629.pdf
    • https://s3.amazonaws.com/tomamujuf/panudes.pdf
    • https://s3.amazonaws.com/marimejerebo/news_world_report_law_school_rankings.pdf
    • https://s3.amazonaws.com/fixararololu/free_air_combat_games.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_off0001006e.bin
755a9590f4778ab119bed4d58e079c7ef48a95197f10fdf0460ee2d08302f673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 5652 bytes
font_01_sfnt_off000113b9.bin
252a832274e1d5bac7e3ab631142d09dea4f8aa6b4b4f9ced3fdfa2958dad572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 11532 bytes

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