Malicious PDF — malware analysis report

Static analysis result for SHA-256 38171b18747df689…

MALICIOUS

PDF

73.6 KB Created: 2021-03-29 19:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 458a120186f848573e940a8f5b9af8d4 SHA-1: 7c8abe84a60fa79fccdd75041518e7c32dbf345f SHA-256: 38171b18747df689b1f287532270963dd8cf008aa894fc97bb46702832636e55
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm designed to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of external URIs suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=pdf+belleza+font
    • https://cdn.sqhk.co/xuxozowaki/dghhgKo/funny_baby_laughing_sms_tone_download.pdf
    • https://cdn.sqhk.co/retakabif/h2ighgt/58036814337.pdf
    • http://visetazide.medianewsonline.com/hindu_temple_architecture_books.pdf
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6056a491efb6c.pdf
    • https://cdn-cms.f-static.net/uploads/4416128/normal_6022622a6ea93.pdf
    • https://cdn-cms.f-static.net/uploads/4380380/normal_60259b85b8352.pdf
    • https://cdn.sqhk.co/xogedusov/ajjojjq/epic_games_stock_price_graph.pdf
    • https://cdn.sqhk.co/boxokozofe/T97UCV8/66733684080.pdf
    • https://cdn.sqhk.co/tedigedubemi/hhihHia/81423025024.pdf
    • http://zabolojisag.getenjoyment.net/mafia_2_crack_fix_low_health.pdf
    • http://reveruverof.medianewsonline.com/43030519481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_33326a3a5f4948cf8ed3bf3b4a06e204.pdf?index=true
    • https://8b1d1a20-f0f3-43d5-aeb5-704ac988d6c7.filesusr.com/ugd/9dbc1d_5acfe8ffe95a46149aa61b42e269b7d5.pdf?index=true
    • http://rixibedi.onlinewebshop.net/2013_honda_civic_service_due_reset.pdf
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_af8d5181a3fa46bc892fdef80e993d18.pdf?index=true
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_fdcb8bf79cd046cca45b36cb8fb05495.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_1a35d9c697d14a2097a64d79b6a698ba.pdf?index=true
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_515c92d122b141c197af153e43e9c795.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ae.bin
0916123e486db2257d824071e93331d2188677a089a3ed4a7a4940fb7c6fd9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 4556 bytes
font_01_sfnt_off0000e448.bin
a1f312d1c3d7ee7c04801e52a7a1ba570a77f5478e5a060904886fd7e40a9af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 11416 bytes
font_02_sfnt_off00010a29.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 4324 bytes

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