Malicious PDF — malware analysis report

Static analysis result for SHA-256 432955bd0ab21de6…

MALICIOUS

PDF

82.7 KB Created: 2021-02-25 22:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f166d3a8d9eff69dcb861b58acc5661d SHA-1: 94410d8a9d6ecf0c55aa768f384514ae49e73208 SHA-256: 432955bd0ab21de6b54768b9f5fce68699e2c064bf94da254aa9b751a9e0f35b
86 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a number for fraudulent purposes. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=onkyo+tx-nr626+price+in+india PDF link annotation
    • https://cdn.sqhk.co/luwukamuku/iiTyoax/33038768068.pdfIn PDF document text
    • http://vizionsmc.net/setejeturezupofj0wmw.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/UiWjhf4/57431223850.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/Agjhjgh/ketulizarezubevosozoxuja.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/ichbPid/megan_fox_machine_gun_kelly_podcast_interview.pdfIn PDF document text
    • http://cocobuka3.xyz/dofixumalaxutavi8f4f4.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/kenmore_microwave_790.803_fuse_location.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/edgiyKk/kakekejage.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/brother_mfc-9970cdw_printer_driver.pdfIn PDF document text
    • http://lnstagramcentre.net/how_to_type_alpha_on_keyboarda5p1p.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/sefukirexuwekij/chpna_study_guide_free.pdfIn PDF document text
    • http://sopokenone.epizy.com/10722610191.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/64965581538.pdfIn PDF document text
    • http://sugomoriwegisi.epizy.com/34684609272.pdfIn PDF document text
    • http://favigagiwu.epizy.com/properties_of_exponents_calculator_with_steps.pdfIn PDF document text
    • http://weweladegop.rf.gd/merriam_webster_advanced_learner_s_dictionary_free.pdfIn PDF document text
    • http://sexikiti.epizy.com/folagepuzezuwadeju.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5436 bytes
SHA-256: dd4645a1923e6926f4a912538ebf3295edc0746160fbe9b01bc4aa412c23bb12
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 11348 bytes
SHA-256: 7db136b4e8e34bfe46b3ea7a5d012b54d2a1e61193dfe8a13c96267cedede822
font_02_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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