Malicious PDF — malware analysis report

Static analysis result for SHA-256 b574f462aeab5e9b…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 16:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9b3b2b8914a5454ca71034a0e073147e SHA-1: e19fe86c0eaca472e14e6a251e44654e69779194 SHA-256: b574f462aeab5e9bfc68a61518ebb155baccdb7f11662437b3dc66b620bf6004
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The primary URL, https://leonvi.ru/strik?utm_term=recoleccion+de+datos+cuantitativos, likely serves as the lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=recoleccion+de+datos+cuantitativos PDF link annotation
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/84d8ac9ca.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/1709272.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/dragon_balls_game_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5ff4b341b5509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fd8a15ea7e44.pdfIn PDF document text
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/9950931.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/kodak_alaris_s2020_scanner.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/association_rule_mining_models_and_algorithms.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/the_way_of_the_superior_man_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6036fc9985d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_600dd2ede80f7.pdfIn PDF document text
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/03b3b452d53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubodadabu.epizy.com/bukhari_sharif_jild_1_in_urdu.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/64843222228.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/magic_chef_model_number_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909a294e-64e7-49f1-ba6e-6f608c9a7c5d/47310803843.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/nuwaxunafumegit.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/rujamasepuzojezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c63fe09-b70b-4280-ad4a-ff1e4cdf1b7f/57406882657.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/intellichlor_chlorine_generator_ic20.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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 4904 bytes
SHA-256: 16089c353ce27ad6a2b89829062aa3a0e9fa345241787d88f817c8659f4cc0ec
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10920 bytes
SHA-256: 872335ce2af9c1bc0e35f66daad1e88bcf61da8ea8394ad1c3d4fa814917979c

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