Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e43e2815a42af34…

MALICIOUS

PDF

101.4 KB Created: 2021-03-16 18:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 888184d63fe261c16b86ccba765b7152 SHA-1: 7140e2baad49fa7491e77c62fce49331baef8cab SHA-256: 6e43e2815a42af343929052a11ab79c61c883d787bf788c92e482d406f0d5674
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains multiple external URIs, with one pointing to 'vilenefex.ru', which is flagged as suspicious. The PDF structure and embedded content suggest an attempt to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=apprendre+le+fran%25C3%25A7ais+grammaire+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462376/normal_6014f3ebbb0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_602ecd2377e4b.pdfIn PDF document text
    • http://ueuniti.xyz/67936241505twjnd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_601e901f1764e.pdfIn PDF document text
    • http://flowerport.store/jivilakujabujovexolorgk2r.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/can_you_keep_a_secret_song_nightcore.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/notepad_xml_tidy_plugin.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/polaris_360_pool_cleaner_hose_assembly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_6002d05450fe7.pdfIn PDF document text
    • http://repair-telefonov.ru/ae_jate_hue_lamho_mp3pbwuq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojudezafal.rf.gd/richard_foster_celebration_of_discipline_table_of_contents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01329a04-91de-4b35-ad7b-b5f11e49c88a/what_are_the_ingredients_in_dunkin_donuts_vanilla_chai.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_5ce5710da4c042a0a1737c9689e0bcdf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97383204-fe54-4bf9-a738-47e101dae007/sole_e95s_elliptical_incline.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_bb12defc2b774dc39c0ac2f94f1ca181.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_5a72bdda76434ddeb1580f233bc2a2f4.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_1e217de9fdb54a66827371b694b86d06.pdf?index=trueIn PDF document text
    • http://volapubexu.epizy.com/lelunopixokop.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_off000149ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EF 5532 bytes
SHA-256: eab3d490931a6bd4fd173a1973fa4a4095455788a3e2948149b4a53634503631
font_01_sfnt_off00015cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAD 12936 bytes
SHA-256: 0ca30c84309b31738c570366b93254d0eb2315fe78574783fdaebfe3dc762e4e

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