Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2848dbc1ff97f18…

MALICIOUS

PDF

78.4 KB Created: 2021-04-05 11:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: df6f9f3a688d460902ceba1ef69763c5 SHA-1: 718a394aec158bcd210c2521ac7d390f38fff884 SHA-256: d2848dbc1ff97f18cee4636cd32683e3476f47b9d421e6a340568073fe91f2d6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous external links, with one prominent URL pointing to 'vilenefex.ru', suggesting it's designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to market share data, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/123?utm_term=android+and+ios+market+share+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464070/normal_6005cd6117b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603bd1f8b0fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_6065d17d24aa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447658/normal_5ff658fa37fec.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/bourns_3296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_606a66bfe97db.pdfIn PDF document text
    • http://kabonuwumew.66ghz.com/bootstrap_4_form_control_error.pdfIn PDF document text
    • http://rajajime.mypressonline.com/603921432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_6fa6bc7277044648b3d36cb98f1de3b6.pdf?index=trueIn PDF document text
    • http://doroxepazu.epizy.com/curriculum_development_in_language_teaching_richards.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_6869de36760340bf86cc9143e9a5c5cc.pdf?index=trueIn PDF document text
    • http://tubujozuvos.epizy.com/free_separation_agreement_template_uk.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_6a2bb966da404faebdb1ace93095dec9.pdf?index=trueIn PDF document text
    • http://gadejoretalul.rf.gd/ng_tube_feeding_procedure.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/hiv_and_aids_awareness.pdfIn PDF document text
    • http://weluzisegi.epizy.com/93462512028.pdfIn PDF document text
    • http://gopikobupi.epizy.com/cdc_shingrix_vis_form.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_49f165ed8eb941f4963941176b002684.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e033f4-ad59-487f-b795-ebdad3006332/boguzasudelukubegog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5369ecb-b521-49af-a8e4-e66df3b6dc13/kozosupiv.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/boistar_goyang_persija.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/93451671800.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_1b3ea0ec54034b48ba421d887c2d864b.pdf?index=trueIn PDF document text
    • http://tixinova.rf.gd/what_year_does_hearts_of_iron_4_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16700d2-b5f5-4bcd-8768-5ef12cf5db23/zolafepij.pdfIn PDF document text
    • http://wutowaxodod.epizy.com/lara_croft_go_android_gameplay.pdfIn PDF document text
    • http://komoridetunitiw.epizy.com/siwajoloduxefagaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c22daa-aed6-47ed-a6bc-abb1b3afb6a0/beginners_guide_to_sketchup.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_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 5568 bytes
SHA-256: 2c6006152bde5cc6498926e44e7ddf094f5c36945e6ce8820c941090fb84ab99
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10932 bytes
SHA-256: b7ac7bdc2e0f8dc45e0f1adc8d473f1cde8b0448089ffa63ead973b667b4e6ea