Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6f092031373342…

MALICIOUS

PDF

67.7 KB Created: 2021-03-18 18:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 83ecfd7a636de68e56ebf1a51e5a2335 SHA-1: a10dc790c3ff159cc215708789ad2be1cfb1e822 SHA-256: 9d6f092031373342bc27b17b7adba834d9b57e7ceda632a98e879f32b1b63c2f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to `https://jumiwimov.ru/wix?keyword=world+builder%2527s+guidebook+pdf`. This heuristic, combined with ML and ClamAV detections, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool often used to create malicious PDFs.

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://jumiwimov.ru/wix?keyword=world+builder%2527s+guidebook+pdf PDF link annotation
    • https://cdn.sqhk.co/lagolipumepi/1Fhim3R/printable_coloring_sheets_pumpkins.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_6033448eb94dd.pdfIn PDF document text
    • http://arenda-comp.space/75356736416ven4m.pdfIn PDF document text
    • http://importants.space/cyberghost_5_crack1dilz.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/hahgjgS/30671717499.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/v41heHA/2020680625.pdfIn PDF document text
    • http://torchland.xyz/american_stories_a_history_of_the_united_states_4th_editionjps6j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5fdad99646a62.pdfIn PDF document text
    • http://masalev.ru/lavatujo6poj8.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/putelekireza/android_wear_2._0_watches_cheap.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_df36b6fb074243b6bbd1c91544e524ec.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_c0d9d1175feb422cbb4b10b52e72e01b.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_a73c7c7bd9d642cd8a32913be13f3d41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/4941747254.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/biodata_format_for_college_lecturer.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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 5252 bytes
SHA-256: 44b439881ed70fa2245f89a35fa780762acd3878485842afb681887484bcf4a1
font_01_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10808 bytes
SHA-256: 4dbd9af42213c8b77353c912e3d50588dc670cdda4b3f463f30c3ae489b35005

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