Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e1406c044969d7…

MALICIOUS

PDF

80.2 KB Created: 2021-03-21 21:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13e58b5c5612d48ed9c72e3241856920 SHA-1: 97647183234954a969bb132059a16fc627425539 SHA-256: e5e1406c044969d7162f8e84089bac99f707ec1fd7d08ab033dbf8112d6e5196
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for distributing malicious content or conducting phishing. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to obscure its true purpose by presenting many links. No scripts were extracted, but the overall structure and URL distribution are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/123?utm_term=airwatch+console+guide PDF link annotation
    • http://fawikenaxalu.scienceontheweb.net/letoxerutuwen.pdfIn PDF document text
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/8338261.pdfIn PDF document text
    • http://kiwikinixibiko.iblogger.org/lamborghini_song_ringtone_zedge.pdfIn PDF document text
    • https://xujupowosorome.weebly.com/uploads/1/3/4/4/134485259/8586727.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzukada/5gjjdpm/argatroban_dosing_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/2iC4ibt/5103559936.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/chapter_8_chemistry_assessment_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/igjchji/drum_machine_for_sale_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/ahidOic/harvard_business_manager_abo_osterreich.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/xamibebulosaxug/14792754813.pdfIn PDF document text
    • http://xewarokulix.rf.gd/3d_drawing_tutorial_using_pencil.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/evap_line_vs_faint_positive_blue_dye.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_214017416a874594a7a472ca609d83fb.pdf?index=trueIn PDF document text
    • http://pudosuvosav.atwebpages.com/assinar_com_certificado_digital_no_mac.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_196b7099131b42a8b73328f681e27f1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/95763337410.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_a09489eab72c4e8197534686dcbbe523.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 5280 bytes
SHA-256: 14f72e7195c6e0752ea64c9518a4f9c68cee04096f5367e111166dd2497468b9
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 10752 bytes
SHA-256: 492fa549250b514fc1a883d95183a9356404323754c6c6009a24e1a5ee782bdb

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