Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1b0d8fb0e9cf69…

MALICIOUS

PDF

82.5 KB Created: 2021-02-13 01:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef96c3fad12f9a95b3f9b6715c5b35b5 SHA-1: 6a7e81860c000d8c371f714779f20a51c3000e57 SHA-256: 9a1b0d8fb0e9cf69c6ac3495e5d3a77d6ac1aa5bd1adc4729c7ed1599bedcdbc
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=vendedores+perros+blair+pdf
    • https://cdn.sqhk.co/defisepeniba/SsiaWOM/86128562714.pdf
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/0286b3b.pdf
    • http://flowerport.market/gel_electrophoresis_lab_report_ap_bio7cgf6.pdf
    • http://doctora.club/keeper_password_manager_costff3i2.pdf
    • http://domensita.fun/dinubuveaxiiz.pdf
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/7668408.pdf
    • http://hellesypakk.online/metlife_insurance_claim_formh1mc4.pdf
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6007b017a435c.pdf
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5fea256fc1a21.pdf
    • http://gladkoe-telo.xyz/4525970768rn190.pdf
    • http://vannabanyavsedela.xyz/gastroparesis_diabetesicitv.pdf
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/8223482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xarojapi/cameraworld_ltd_formerly_digital_depot_stevenage.pdf
    • https://s3.amazonaws.com/lomiwexuva/bigomixigewikaxujuxa.pdf
    • 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_off0001066c.bin
5438c91150359c821b0d3aa6e34558472818623d1c521afdb77ab98bd6d6460e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 5140 bytes
font_01_sfnt_off000117f0.bin
e3bfd49b3ea8ea361126edcc938218741229f522ee3665b795cf4653ee537335
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 10664 bytes