Malicious PDF — malware analysis report

Static analysis result for SHA-256 550603eb5af7fdf5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 13:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf268f95fc0bc3cde1085eacf253e33d SHA-1: 290de84732db0cb58476719abb1ea320f491e89f SHA-256: 550603eb5af7fdf5e2d816d2c507e755dd79b1e42a14bc19b1ac9dc3e46af786
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting or potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host many links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=how+to+steam+cauliflower+in+power+pressure+cooker+xl PDF link annotation
    • http://domapekoti.22web.org/74410686531.pdfIn PDF document text
    • https://cdn.sqhk.co/luwanuriwaba/irja8Yi/tavumirafefotipe.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/dukhgij/bingo_markers_chips.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/how_is_social_learning_theory_used_in_social_work.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/miseguv.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/whirlpool_duet_washing_machine_parts_manual.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/3542602.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/52723267f6395c.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/will_humans_live_longer_in_the_future.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/oxford_picture_dictionary_monolingual_english.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/the_negro_artist_and_the_racial_mountain_citation.pdfIn PDF document text
    • http://ninavadilu.22web.org/43136677065.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/dudujopixejikug/rovipatujanibexevoninepa.pdfIn PDF document text
    • http://davafegi.epizy.com/what_kind_of_juice_do_you_use_for_mimosas.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/koxatib.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/faxagimebi.pdfIn PDF document text
    • http://dajomilot.atwebpages.com/xijejipasobow.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_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 5344 bytes
SHA-256: e599b9d19fa54b0cb33517c50f6b62650e49999e2b4d9d45b48d3814203024a9
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 10740 bytes
SHA-256: b93d1576ed423bdb18b149baedcde56b1dbf017fe3c5cae2b381a438f85c25fa

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