Malicious PDF — malware analysis report

Static analysis result for SHA-256 436fff1e0dfc9922…

MALICIOUS

PDF

67.8 KB Created: 2021-03-19 17:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 397b5a6723ceb88508a2b6504890e9e9 SHA-1: b80fcaa089f16a153929caee29a6ebc9a6b4fc27 SHA-256: 436fff1e0dfc9922a5787c8aeebbae7b504657bdbbcb4545e7d50807961802f8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs, with a prominent one pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to popular media, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=rogue+one+uma+hist%25C3%25B3ria+star+wars+mp4
    • http://joriwolujuf.sportsontheweb.net/80634570423.pdf
    • http://gapijet.scienceontheweb.net/75640367211.pdf
    • http://dodajavux.scienceontheweb.net/game_of_thrones_books_reading_age.pdf
    • http://muzibatixabu.mypressonline.com/business_plan_sample_format.pdf
    • http://mudikovarew.mygamesonline.org/room_agreement_paper.pdf
    • http://moxolesapudeli.22web.org/35867952180.pdf
    • http://raguvigawak.mypressonline.com/fuwasorasomugadufetedodin.pdf
    • http://xakaderinetatu.mygamesonline.org/dirichlet_and_neumann_boundary_conditions.pdf
    • http://felezebelitex.iblogger.org/vewasopevoxekebawufaku.pdf
    • http://jabilevij.mypressonline.com/pipadovuzebakeredaxabi.pdf
    • http://memisada.mygamesonline.org/cdc_bubble_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb2d8024-cc97-47dc-9573-caf33dba279b/20378256574.pdf
    • http://xaxuvep.epizy.com/56869580003.pdf
    • http://jefeduwikiw.epizy.com/storyboard_template_for_apple_pages.pdf
    • http://tozemuj.rf.gd/nosunadirudugilogibogumat.pdf
    • https://s3.amazonaws.com/limepusotanal/technical_analysis_books_free.pdf
    • https://s3.amazonaws.com/buponuwebi/wikalakuxarojo.pdf
    • https://uploads.strikinglycdn.com/files/33ecb1bd-3800-467a-b4ef-6ec506a81c89/71153020586.pdf
    • http://jasobetesoze.epizy.com/answer_to_thank_you_note.pdf
    • https://uploads.strikinglycdn.com/files/a609def3-26e4-4739-ae13-ff8403d277ea/65352786179.pdf
    • https://uploads.strikinglycdn.com/files/661a3de2-4b89-4e86-8fcc-282e64f655b5/48631392440.pdf
    • http://revudipepofaten.myartsonline.com/grade_2_ac_separation_healing_time.pdf
    • https://uploads.strikinglycdn.com/files/7c76203b-6de9-4ac4-9822-29fb9e1df80d/presto_dehydro_digital_food_dehydrator.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_off0000ca88.bin
bfa817a95570c67c65f31067dda3d9345e1e54ae2ec73188735868ebdba86453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 5524 bytes
font_01_sfnt_off0000dd06.bin
0a258bef96e4202d6bcf8623cc2de6e1ad69a4b0ea540b41c95c5acbda30c757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 11016 bytes

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