Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5fb2e9bc69e253…

MALICIOUS

PDF

87.5 KB Created: 2021-03-10 19:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 17a9f0b64db372251deb1119c774c31e SHA-1: d448f3e9eeb9adb3b2f2017b39292f1cd1e88594 SHA-256: 5a5fb2e9bc69e253bc4bad57e57a761d6f3473e6c30820b49e2a2d734945e864
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, https://golowaki.ru/award?keyword=apprendre+portugais+pdf, being directly associated with the malicious heuristic firing. The document body, though heavily obfuscated, suggests a lure related to learning Portuguese and mentions wkhtmltopdf, indicating it's likely a generated document designed to redirect users to malicious sites.

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://golowaki.ru/award?keyword=apprendre+portugais+pdf PDF link annotation
    • http://kijofizovurisos.medianewsonline.com/ford_mustang_mach_1_1969_price_in_pakistan.pdfIn PDF document text
    • http://nisiwitas.22web.org/duxenowitomapojetorewip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_5fe9e08288eff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5fec237235a14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485299/normal_5ff2b1b05c7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6041c7528929b.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/bsf_questions_and_answers_genesis_1.pdfIn PDF document text
    • http://lalojit.iblogger.org/gawexen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1b1f3c-a3b1-4c41-8b21-8c0f4add9a2f/hp_officejet_8620_replacement_printhead.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/blodgett_zephaire_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcce8c9-e9f9-4696-963b-29b52cd12876/how_to_repair_refrigerator_not_cooling_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a522d7-451b-42ff-8e4d-f93fc57f7489/vipir.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/42243829826.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/biwunupewasuwawigibasotix.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/avengers_endgame_ost.pdfIn PDF document text
    • http://jenefidozepojig.epizy.com/auto_chess_mobile_mage_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ad2e7c-a069-43a4-b641-3166e7a344be/world_map_with_oceans_and_continents_labeled.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/what_made_them_write_the_declaration_of_independence.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/why_does_my_furnace_run_so_much.pdfIn PDF document text
    • http://gipizaz.rf.gd/maths_book_for_class_11_ncert.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_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 5164 bytes
SHA-256: 6bdc9a04b90be5c5ed6ca87718a39ccadcc07f461baf0fdc46d2228fc4ff2c63
font_01_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 12232 bytes
SHA-256: 6edc7b209c0a0ffd404b64bde48924ae46618c0c7de34f2764205939a44b0e39

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