Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41ee19482fc0fdb…

MALICIOUS

PDF

87.6 KB Created: 2021-03-14 06:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 83d6c699ab8c16f92e39debeee368d2f SHA-1: 99949b135e6706e7c38cfa7afd8ff00722350d0e SHA-256: b41ee19482fc0fdb09a3fddf7136a3d7cceb32e4314206f59ac38dd169b0b36f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'bayes theorem problems pdf', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=bayes+theorem+problems+pdf PDF link annotation
    • http://bafedudovodamo.medianewsonline.com/how_to_watch_after_we_collided_on_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ciczhg4/bee_factory_cheats.pdfIn PDF document text
    • http://whalesqpa.fun/ctet_question_paper_20203auhx.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/the_professor_and_the_madman_storyline.pdfIn PDF document text
    • http://theharaka.online/certified_nurse_aide_renewal_form_texasah9iy.pdfIn PDF document text
    • http://flylovel.com/ancient_magus_bride_ruth_dog_breedtgi92.pdfIn PDF document text
    • http://1freedom.space/top_secret_restaurant_recipes_todd_wilburpaee0.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/djjifha/58281326317.pdfIn PDF document text
    • http://zulesaxeririv.sportsontheweb.net/definition_of_geography_by_different_authors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasesazolaf.myartsonline.com/att_arris_nvg589_firmware_update.pdfIn PDF document text
    • http://tagekef.rf.gd/batopiwedurefatibuxawuxil.pdfIn PDF document text
    • http://nulebizazawivuk.epizy.com/capital_market_participants.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_2b2b9a1040584c71a2cfc98d54811308.pdf?index=trueIn PDF document text
    • http://verekoxamokit.epizy.com/best_workout_dvd_for_seniors.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_752505aa4d16467095eeb916d184d174.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_b0e78e96432f42bbb1945a0d8ae7aa50.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/blogs_de_libros_romanticos.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_6a8921f33f99432cb85bdc51518bbe89.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 5572 bytes
SHA-256: 6b8986e5516e811d7f23c5eec620d51c3bb94873c39279db846f2ac032feda87
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 2172 bytes
SHA-256: e898010427f8b6d918e446b9b13f852d93f7c8cf29bcbec3cb1571e36c962f37
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 12140 bytes
SHA-256: 4c985bc873b18509b2e9705f06d4a6a7ca694ee4b621d5c10debec2bdbdb5a8b
font_03_sfnt_off00013ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 16160 bytes
SHA-256: 31f8c90d7e859fb10097cc7b5222f472bb898949aaf5ec201de90611c41c06f9

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