Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c3d386e135a7da…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 15:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b87d462026d1129d0bffb11cceaea0da SHA-1: 7d2cd548ea83b7e84ec690a76ec107911fe9197c SHA-256: 39c3d386e135a7daff3eb8f8fdfc3335b50dd778646bd9d4ccc7dbb35f9a444b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious content within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=msi+970a-g43+plus+release+date PDF link annotation
    • http://qrettalq.online/how_to_adjust_the_float_switch_on_a_sump_pumpx3ayg.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/infinix_note_4_x572_price_in_kenya.pdfIn PDF document text
    • http://websecurer.tech/how_to_fix_diehard_battery_charger65p7v.pdfIn PDF document text
    • http://nout-prokat.website/bowovewedenadaklp23x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_6039db34a6f2c.pdfIn PDF document text
    • http://peuer.xyz/fibugimasenufunanibokakurmcl60.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/rewards_program_readingwru24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_60309312a5811.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/char_broil_turkey_fryer_accessories.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/how_to_draw_a_simple_cartoon_girl_face.pdfIn PDF document text
    • http://justiciaforjustice.com/city_of_calgary_recreation_program_guidelhr3g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_9961e244ba444e7e86df4ab052fa1108.pdf?index=trueIn PDF document text
    • http://forojiwimudobo.atwebpages.com/how_to_setup_canon_pixma_mg2522_wireless.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_2986718ff4ea4532bc92d43259a01163.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/apple_forgot_security_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/98574494845.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/10402460457.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_8a7dcc9a78b14d75bd6d68018e051846.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_03ea8968e30d492082315fd0802a40a5.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_834cd12e1e0f4010939bfbd8df856196.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/android_chrome_artikel_fr_sie_deaktivieren.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/45390165414.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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 5792 bytes
SHA-256: b332ed86566c6ff854d20d60e234801a5b915fb7a7bbb711d7ed309ad9b61c12
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 11760 bytes
SHA-256: 0e153d34867dded631459f5252ab2442469f10bd2c105147012f78dcc778fa04

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