Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd41b5b99b14b4b6…

MALICIOUS

PDF

73.8 KB Created: 2021-03-10 14:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3e93fefc4eab80ec0cd7377030882035 SHA-1: d5bd081ac2760b4249fab44b349e4e509ca2d36d SHA-256: dd41b5b99b14b4b601096fe8dc77b49f97b3e8fac5db574446529fada4111f15
126 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM, indicating it's part of a link farm designed to host malicious content. The embedded URL 'https://leonvi.ru/award?keyword=ethnic+diversity+definition+pdf' is flagged as unknown reputation and is likely the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=ethnic+diversity+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/zetanitanedo/gggijam/luzumatafufaxofa.pdfIn PDF document text
    • http://sokelekife.iblogger.org/slow_food_carlo_petrini.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/dqGUnnj/63280013130.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/vujugosafima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debiwelof/weather_report_lutsen_minnesota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23d5aa2-be28-4d5d-89be-1cd488a6e90a/how_do_you_describe_percy_jackson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd542f86-a93d-4e52-bf04-440ec7e1f79f/w_on_transcript_pa_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7abc58-3614-4c28-af69-adb266ae9d11/the_adventures_of_sherlock_holmes_book_summary.pdfIn PDF document text
    • http://midabufab.rf.gd/mesuropijaxetudolizef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d6cdd3-c6aa-4809-a2fd-147c60b01525/wahl_lithium_ion_beard_trimmer_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7122b0f3-9746-4eea-9491-84ff7db274e4/90013879626.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/kaximenenumugoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbeaee49-1190-4791-8244-da58a49d1057/husqvarna_372xp_max_bar_size.pdfIn PDF document text
    • http://renunuxuxalebav.epizy.com/sonovixubaxosene.pdfIn PDF document text
    • http://natomilalusirof.rf.gd/motorola_mc55a0_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345ee15d-4720-4fea-9412-a59a8c206212/65330055581.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/32657877464.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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 5120 bytes
SHA-256: f3c0e59016314e71193c96021078238dbd2b6ff65c2644a6f479dd387016ad45
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10184 bytes
SHA-256: 87a17a4a4864667f2e8407c1feab00e746f5982d931729f4fd761aeb76a56217

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