Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a8e282dcbfe7bc…

MALICIOUS

PDF

83.9 KB Created: 2021-04-02 05:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 133722acfdea60fb6f66ba1a878a83a6 SHA-1: 76471b0c350c58e4acb34e018d4cfebfa905931f SHA-256: 54a8e282dcbfe7bc15b366c1e50756ade43ec5f7ad4cca63e29be5efb5060a54
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary focus on 'https://leonvi.ru/strik?utm_term=delta+22-580+parts', suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=delta+22-580+parts PDF link annotation
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/498730.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/182031.pdfIn PDF document text
    • http://mgacessoria.online/anemia_perniciosa_autoinmune5cmrl.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/genokoxoteg-wurijaziko-vexut-nosunaw.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/19065461178.pdfIn PDF document text
    • http://repochka.site/www._njmvc._gov_registration_renewal_onlines5l45.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/32765394599qp7d4.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/tlc_discography_rarqczp8.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/bodyboss_ultimate_body_fitness_guide_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7592bde6-2bbb-400f-b3dc-93661effe9fe/bavumid.pdfIn PDF document text
    • http://xuvatifovefad.epizy.com/4_day_muscle_gain_workout_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6891db-560c-4c4d-8cc2-3032be3d831b/nerf_real_bolt_action_awp_sniper_rifle.pdfIn PDF document text
    • http://nodafawujanego.rf.gd/56085350093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba1e474-7471-4a43-93a3-149f4f3f7774/survival_servers_minecraft_1.16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978da25d-c98d-4985-9e3c-9ddf6df05312/razer_blackwidow_ultimate_2013_keycaps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa39ae3-76c6-464b-b8b7-71f9396cd02b/hp_deskjet_2620_price_south_africa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 4960 bytes
SHA-256: be54ad2617cff8b436a40f396b3a62fa4b0cf7089012db5fee7ac84772186604
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 9880 bytes
SHA-256: f8afca30ebd8e0f8ad014a489db5e25f20983b87cc82e12ee66d29bdabb9d3b0
font_02_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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