Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc109f1cf87233d…

MALICIOUS

PDF

83.7 KB Created: 2021-03-24 04:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c3cdf4d8d94d666a29cf89a44a5b1462 SHA-1: 233843d95460761439dc0370f065a73d5d1d8ab1 SHA-256: 4cc109f1cf87233d05b0499a02acae8d29eca41ff1f74750a6ccda3514359e08
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru', suggesting a redirection to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=jumper+dress+outfit+ideas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5fd1264aeca3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_60515a81d4290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_602335e6b086f.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/cbse_maths_book_for_class_6.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/why_isnt_my_kitchenaid_dishwasher_drying.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/54296687262.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/a94eaf4ef02c.pdfIn PDF document text
    • http://wide-do.top/fugefapesugegamuzizigavuu36lg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5fffb54c520fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5fe2a50ab84ff.pdfIn PDF document text
    • http://bigowet.xyz/song_of_solomon_8_6_kjv094vz.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/2192079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokepomi.onlinewebshop.net/39889420783.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_3fb0ceafa5b445ed9e0eb0d8b06d02a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9cfef3-6b0e-4d39-8d7f-f1c5a4c7224d/koviwe.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_e657eb799b444c36ac03cecb59efb0dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0399b85b-a4bb-4dc4-9f34-dd46a537958f/what_stock_markets_to_invest_in_gta_5.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/guitar_chords_lesson.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_68fdf9d1ffac4c70a6cfbee2376251b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddd95b9-84af-41ac-acee-3e897eee344b/how_to_find_distance_and_displacement_on_a_position_time_graph.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_e9e4e819cbc74534bc7cac7f821e6cb3.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_61e493a0830e4091b08e232701448b8e.pdf?index=trueIn 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_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 5144 bytes
SHA-256: 3eb68978d83ac3f3925796219ecacdc3d5c9bc18da7b2a6557f681c47ddf2a07
font_01_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 11164 bytes
SHA-256: f3dfaf57507504ed311b16a5c5e94780b8d7d0d3f1b0b031da45bad70f8c802a

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