Malicious PDF — malware analysis report

Static analysis result for SHA-256 944ba882e6fcf8bb…

MALICIOUS

PDF

71.0 KB Created: 2021-03-18 11:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ca12fa7540bbfdd8b3604caaa48c9d05 SHA-1: 5db11f838aacaecdd5077954cdea84470ca0e637 SHA-256: 944ba882e6fcf8bbf86bb262085031f92083a34cff9173e9b98824a6566cefc2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/award?keyword=intermediate+accounting+15th+edition+solutions+manual+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465707/normal_6032a53094d46.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/zuvokuw.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/perfume_the_story_of_a_murderer_2006_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_600a11cb5a6f9.pdfIn PDF document text
    • https://cdn.sqhk.co/tisezalave/1igighe/vintage_craft_master_paint-_by-_number.pdfIn PDF document text
    • http://govovimifakine.mywebcommunity.org/lactogenesis_y_lactopoyesis.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/fii4bij/miped.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/wjg8ibk/spiral_warrior_game_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/hcgeEia/28341652497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xazopufegi.onlinewebshop.net/analysing_data_using_spss.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/30464325743.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/communications_director_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/50991579759.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/gafelijosewinusaxotuwaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/anticlockwise_after_the_rain.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/fikukil.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_640866551e2e4c519148a4e5e89fe164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/constitution_hall_pass_legislative_branch_worksheet_answers.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_6cbeac33492d418eb64236f7274a24c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/corporate_board_of_directors_resolution_form.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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 5680 bytes
SHA-256: ac6b8216cd069ca9483083d80d0e718dabb9ab34a0a6286802332447e24cf301
font_01_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 10788 bytes
SHA-256: 74f075f95455bf505f12370de1319fe89928cb572be78af7f4208a4d17e6c425

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