Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a6cf5f15c300d0…

MALICIOUS

PDF

78.4 KB Created: 2021-05-12 00:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9b9290cd7e67b93297196df4f9ae8ccb SHA-1: c3eea33f75641aaf29ebf0de852504f9437ddfaf SHA-256: 37a6cf5f15c300d06c915e6ae1aa6cd065802b2629082a3152f25020bb04c628
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm on disposable hosting, designed to redirect users. The document body text, though heavily obfuscated, contains keywords related to car parts, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=2006+honda+civic+ex+performance+parts PDF link annotation
    • http://roboludawu.mywebcommunity.org/algorithme_tableaux_exercices_corrigs.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/gevovenonex.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/28356485939.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/posijepagadaxu.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/83612503640.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/sunarelezosisezedugudu.pdfIn PDF document text
    • http://indital.fun/how_to_write_a_narrative_essay_about_overcoming_a_challenge3n5qg.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/163316.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/ankush_lamba_100_puzzle.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/xagofugafokenenolepozo.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/3239692.pdfIn PDF document text
    • http://kernig.pro/83778436254ym1e6.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/the_path_to_wing_chun_download.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/tuvajiloramezepodoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a956cf23-f449-440d-9273-b7b8442555c4/wazadawamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f81c89-e132-4ad5-970d-261bf2d62361/pifagekobifapubajomizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083e51b1-6574-4612-8076-6fae18a3f3e8/world_of_ideas_plato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef124bba-42c7-4e03-ba46-396eed7e00f0/palajekatuloletuporaxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981c8898-2c53-4ca2-9093-0dc3ee0fe863/conflict_resolution_skills_between_couples.pdfIn PDF document text
    • http://luvepel.myartsonline.com/xotaxamu.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/adobe_editor_license.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/pikotizetagaxivu.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5824 bytes
SHA-256: 4987bf69d931af76d9e21865d4f912f0eb53d82b1b71c68a52869595c94909e9
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 11140 bytes
SHA-256: 8e2b9c15c8f84ab89214b5c2edf7cba00dc4218a63b1bbaa54a9966a116d07f1

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