Malicious PDF — malware analysis report

Static analysis result for SHA-256 2094594e4e9acf34…

MALICIOUS

PDF

81.9 KB Created: 2021-03-13 21:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d63cd1ca726892b38bebc30142ba504 SHA-1: 16510c574d357103c1a8dd6b1ca684850873d50b SHA-256: 2094594e4e9acf34f06d51459c67d52ad6470a0df9681ebd10b83ab1ea550bf1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one notable example being https://golowaki.ru/wix?keyword=dire+boar+5e, indicating a link farm designed to redirect users to potentially harmful sites. The document's structure and embedded links suggest an attempt to disguise malicious activity as legitimate content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=dire+boar+5e
    • https://cdn.sqhk.co/wegodimumod/Ql1hjfi/uniform_motion_speed_and_velocity_problems_answers.pdf
    • http://urolog.xyz/what_is_the_true_meaning_of_datingz0lu7.pdf
    • https://cdn-cms.f-static.net/uploads/4500665/normal_601d658f5fc8d.pdf
    • http://daliadiago.com/sole_e25_vs_e35_2019fqi8j.pdf
    • https://static.s123-cdn-static.com/uploads/4470699/normal_5ffdd3ce59235.pdf
    • https://cdn.sqhk.co/puzokopu/gegigfc/sovosusazakotolu.pdf
    • http://fruct.space/tiwekomezot20ejw.pdf
    • https://cdn.sqhk.co/podiwilur/hcCDGSn/super_smash_stick_fight_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6041794be556d.pdf
    • http://therarbooks.com/fibipapamimodexa3rtrm.pdf
    • https://cdn-cms.f-static.net/uploads/4464996/normal_602b9dd939902.pdf
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5ff8566f430c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_ee7e715ef5fb43d0992f8b1a3ad35102.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c1de201-3fb2-4058-b5b5-5097b1a24ef4/57384199141.pdf
    • https://s3.amazonaws.com/jonora/coshh_data_sheets_tesco.pdf
    • https://uploads.strikinglycdn.com/files/1b62caa7-704a-469c-877d-bac67e2bec42/toyota_rav4_hybrid_problems_2020.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/rolunupimitozozepap.pdf
    • https://s3.amazonaws.com/xirixepo/38774895932.pdf
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_69210a449e6549a6aefb938493d27d16.pdf?index=true
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_edb29470df324ee0b9e8200e592b84e6.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_e30a7058e8294f8bb88ae324fbbcb8b3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023c.bin
a7f28488160eb4dcdae0586c77c7bded9ef62824a6369d1d44a66820c80a75d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 4732 bytes
font_01_sfnt_off00011269.bin
2c8da6d1ea47dd05e741d98f69e66e700873376cd7dcd3d5d16b2bbf1b200e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 12060 bytes

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