Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ffab8b73de08c0…

MALICIOUS

PDF

82.7 KB Created: 2021-03-24 19:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: efb0be0ecf385c600df67559ee21fbdd SHA-1: 35af5ed41d3a8045436ecd65230e8822db0985d3 SHA-256: 28ffab8b73de08c00f3cba65920b4813ea4d5b658a4b394be5ae6f988ffdc93c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The document body, though heavily obfuscated, contains a search query that could be used as a pretext to drive traffic to these malicious sites.

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=can+i+use+any+router+with+verizon+fios PDF link annotation
    • http://milky-rp.space/niluriwaelt2c.pdfIn PDF document text
    • http://ozalupa.space/beretta_a300_outlander_turkey_review3qyqy.pdfIn PDF document text
    • http://kevikakagax.iblogger.org/55098740037.pdfIn PDF document text
    • http://merovew.xyz/monuwisizuvovewixenivikiieg9n.pdfIn PDF document text
    • http://afracheat6.xyz/75265170569qnbq7.pdfIn PDF document text
    • http://probmaka.tech/creative_inspire_t3030gkmh1.pdfIn PDF document text
    • http://mozodulo.iblogger.org/aclarar_cabello_negro_de_forma_natural.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/2_g_ml_to_lb_l.pdfIn PDF document text
    • http://vipmanmarket.space/32506150501v9po1.pdfIn PDF document text
    • http://sweetygirl.club/90329100190qizem.pdfIn PDF document text
    • http://mon-compte-cmb.best/enthalpy_change_of_solution_definition_ocrrp2bf.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/jijixurelore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_cf0aee97623d435bbebe3005d5c88cf7.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_ef427a099eea44d2b41de6f27ca23350.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_8160b53c542b4b9ba47036d73d4af3e6.pdf?index=trueIn PDF document text
    • http://najukelosuned.myartsonline.com/85034566654.pdfIn PDF document text
    • http://tarefipiv.rf.gd/99834275473.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_20c6f6a7bd9445ae89413cf692e68594.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_a2bd30c9a7da4d33996d76391d9542c8.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 5032 bytes
SHA-256: 84fdb4e46b6b2955b7eac1bb84aa7adf5bd6a0ff9fef9fa5072de29317bc320d
font_01_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 10936 bytes
SHA-256: e76ebb1f18da012b50d4bd0d68dd9c3491cec839d886c15bed0e87ef69e05a4e

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