Malicious PDF — malware analysis report

Static analysis result for SHA-256 73235ca75d1163e1…

MALICIOUS

PDF

86.0 KB Created: 2021-04-09 10:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fb99fed843da720cc787b8e8aea60a07 SHA-1: c5472ab078c8f6763df9da59c6819523bd1ce297 SHA-256: 73235ca75d1163e180b6b8bf72ce4ebbdc151da38c66abb297a49497ce5c684a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to vacuum cleaner manuals, directing users to a malicious URL for further action. The presence of external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful content.

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://xezojetit.ru/strik?utm_term=bissell+vacuum+cleaner+manual PDF link annotation
    • http://loxupudo.iblogger.org/car_coloring_pages_corvette.pdfIn PDF document text
    • http://cabinetshub.xyz/kenmore_gas_range_790_knob6f8p7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5fdfaba4f21a5.pdfIn PDF document text
    • http://liko-sneakers.com/the_100_books_everyone_should_read_equalizer5ea08.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/who_manufactures_toro_snow_blowers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_6028a3413c555.pdfIn PDF document text
    • http://steh-sistem.ru/parts_of_speech_practice_with_answersro3p8.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/janufuzovadaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamakisubageto.epizy.com/47170098567.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_9082728b70a2472ba13d40e4bda3180d.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_74f2306f786e4c058144b1530e36ca83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/nutone_central_vacuum_installation_manual.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_c00db21d0da14023b6a5aaa0563860e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/bendamustine_and_rituximab_patient_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vocab_workshop_level_f_unit_6_answers.pdfIn PDF document text
    • http://sarilakisorowev.rf.gd/boost._asio_c.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/little_fugue_in_g_minor_organ.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_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 5052 bytes
SHA-256: 126bac9d81c10452869772b8cbcd9bb0f5156eb193fabd368ee1857f83f0d72b
font_01_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 11252 bytes
SHA-256: 650b6fc264ebc63ce88ecdc0f9992f065623c84ce01c1cdeafbd563009f8d830

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