Malicious PDF — malware analysis report

Static analysis result for SHA-256 331b003acb4efbbc…

MALICIOUS

PDF

74.3 KB Created: 2021-03-31 16:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b67be8f60b9838185eadfa5357f9e293 SHA-1: 0abc04ccac48c9e7c69784463947a568a94c6437 SHA-256: 331b003acb4efbbcebf05ee4e47dead1b7517c2d346c57d58fc7294e49658092
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains multiple embedded URLs, including one that redirects to a suspicious domain ('maypoin.ru') with a query parameter suggesting a lure related to a book. The PDF structure also indicates it's part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/strik?utm_term=a+clash+of+kings+illustrated+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/gevagedubop/ichgxjg/jokujubiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_60255b2f6c2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jf6heje/call_jojo_siwa_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366622/normal_5ff5da0892076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxuzaxupamul.rf.gd/sample_radio_commercial_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242c8109-6ad5-4cde-a622-76dfda15b13c/norcold_refrigerator_door_repair.pdfIn PDF document text
    • http://fomideveli.epizy.com/1_3_4_pulgadas_en_cm_cuanto_es.pdfIn PDF document text
    • http://dupavumomupu.epizy.com/rigoxixokadiko.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/90952796106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bde8ac-3a10-4b5c-b56f-fb7dc5089e0e/civil_engineering_material_testing_lab_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a60c51-5c90-430a-8129-102c4109d54e/savivavefewinuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15660a89-d2ea-4e08-a5a3-641e7e252379/wexarol.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/vazegusof.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/50726517892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044eea85-acf9-412d-b3ad-5e7c5ed1df86/cen_tech_battery_charger_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7137ad50-2391-4fad-8dd5-57b1a760dc8b/harriet_tubman_autobiography_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae58af9-2781-421d-8276-598809cd2cd3/kozesisanukuwe.pdfIn PDF document text
    • http://motozotofo.rf.gd/bolonaredajunapinivaj.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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 5468 bytes
SHA-256: 1181974cb49fc6010aa11de7f27556b6930462b3e8d6785e5f0059ef6a7edaec
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10460 bytes
SHA-256: 26fb868cfc7f5a5300562689cbe79823f317a6029c3f70b0891aca5aaa8f379c

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