Malicious PDF — malware analysis report

Static analysis result for SHA-256 62039d3eea2e2297…

MALICIOUS

PDF

78.4 KB Created: 2021-05-15 23:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d99950668c8f1c9698a94a193557ea6a SHA-1: d929dc2ba93579fd9e488098c54fce7fde791549 SHA-256: 62039d3eea2e229783a74721dbff5fda4893050627cfa566df3b4f7c03232b79
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable hosting and are used in a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=lowrance+elite+7
    • http://avtoshkola-region26.ru/difuvanidavivonust40t.pdf
    • http://slimitalia.space/jikebojumopozonlpkkv.pdf
    • http://siwivelijutore.medianewsonline.com/11719647045.pdf
    • http://gexomafe.mypressonline.com/vizio_sb3820-c6_38-inch_2.0_channel_soundbar_review.pdf
    • http://fruit-italy.space/90319441760uyvng.pdf
    • http://xijipeva.mypressonline.com/difference_between_cpap_and_bipap_ventilation.pdf
    • http://rolorutebu.sportsontheweb.net/vixumovoso.pdf
    • http://seviregigaguz.22web.org/57822581215.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bevarolimesale/pubujiwafekaranutoma.pdf
    • http://bufizufidubak.rf.gd/lotuwot.pdf
    • http://vuginok.epizy.com/marumafalojurisumikadejut.pdf
    • http://gebezivorubax.rf.gd/90576569018.pdf
    • http://soxerufazele.rf.gd/allen_test_papers_class_11.pdf
    • http://xakonike.epizy.com/21731602064.pdf
    • http://nakepusigazu.epizy.com/persuasive_essay_samples_for_5th_graders.pdf
    • http://babivukir.epizy.com/maliwunubawasonadam.pdf
    • https://s3.amazonaws.com/tidigudetefumof/fodemikafalexejode.pdf
    • https://s3.amazonaws.com/kodipopujufipig/tabla_peridica_en_ingls.pdf
    • https://s3.amazonaws.com/xelimewat/how_much_does_it_cost_to_service_a_mercedes_benz_c_class.pdf
    • http://tuguwobafadurot.rf.gd/beall_s_list_of_predatory_journals_2020.pdf
    • http://tarobajasupimi.epizy.com/pinigerasewi.pdf
    • http://kewagar.epizy.com/safety_glasses_z87_oakley.pdf
    • http://vepitejususas.atwebpages.com/brand_awareness_marketing_plan.pdf
    • http://puwolir.epizy.com/miwamumapoledepi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f475.bin
03721180fadd580b4253c162ce50bcc1c924df1a79eada3b0aedaa0dd8a2658f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 4728 bytes
font_01_sfnt_off000104b3.bin
2a7a49fd8b1301a8147d8e795b7789675346813c3cee322f7229e47399155d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 11676 bytes

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