Malicious PDF — malware analysis report

Static analysis result for SHA-256 5331a53acb6cae42…

MALICIOUS

PDF

133.6 KB Created: 2021-05-10 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ee58f9ddd55fb7fe1166e49cd35848c2 SHA-1: e416b6597353ad091fcb690a3bbea55e2dc1ef2f SHA-256: 5331a53acb6cae42b28858341f3b19045570669bbf194ecb61df41d0ccb22ff7
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that, when clicked, likely leads to the download of a malicious payload. The document body, though partially garbled, suggests a lure related to downloading a textbook, which is a common social engineering tactic.

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://leonvi.ru/strik?utm_term=voet+and+voet+biochemistry+5th+edition+pdf+free+download PDF link annotation
    • http://shoop-fk.ru/youku_for_pcisqrd.pdfIn PDF document text
    • http://vizemezezu.sportsontheweb.net/javofaxatoti.pdfIn PDF document text
    • http://fofoketezifofi.22web.org/what_is_the_size_of_an_acre_compared_to_a_football_field.pdfIn PDF document text
    • http://fitnesspack.net/ciabatta_bread_nutrition_informationl7ocm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazofi/pudepu.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/97162560951.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/67580365700.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/dixuzofokevebilomonebezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca05cc49-a7f3-4ec1-bbe7-b613b4636fa6/9332831308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d046c9c8-2022-4578-8793-b868c4491645/80s_techno_song_how_does_it_feel.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/calories_in_a_small_taco_bell_bean_burrito.pdfIn PDF document text
    • http://zevusup.atwebpages.com/emarketer_ecommerce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e38dff-c435-406b-92d8-6fb72b02a5c3/vutujuvoreveretotezatejup.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/71899557804.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/iq_test_questions_with_answers.pdfIn PDF document text
    • http://vojamul.epizy.com/fodevipa.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/internet_marketing_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/17020291209.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF46 5876 bytes
SHA-256: 2cad228083e31a723c4fd22317886e7cbfa3748d7dd35181e8bad49fa6529522
font_01_sfnt_off0001e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E340 11008 bytes
SHA-256: 0b3182cc1fbbb9b32daed4bd5fee2e3f5d10dfae28c2444cbdcaa24a6513765c

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