Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefdf21adb86d151…

MALICIOUS

PDF

73.8 KB Created: 2021-03-30 23:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48b543aab0e633a62c27af534e7ced5a SHA-1: 5f31fcf308dea4806777b5c7393c5a0a8c68a1a6 SHA-256: cefdf21adb86d1511f062f83c4e1062106a61122e970c2920770a5f10186d64a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=cuisinart+dbm-8+grinder+review PDF link annotation
    • http://conicppjry.bid/shri_krishna_bhajan_video_hd4q8uh.pdfIn PDF document text
    • http://theandyhong.com/sat_qas_testsu1rrb.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/50_tons_de_cinza_download.pdfIn PDF document text
    • http://idealsit.fun/samsung_c460_driver_windows_7e937n.pdfIn PDF document text
    • http://rasprodavaika.ru/what_is_composition_in_photography_definitionydubr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_40ac978074cf483fb7b302c9d175b9ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desenaz/21983547653.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_5683250f2e63499fad343f118d9c4488.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_c99c1b7b773a4a5c824737eca78bd007.pdf?index=trueIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_c4941915f81847b98d9963f01a6b954f.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_4469aa570a354e869639784248619ec7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/who_rules_the_world_noam_chomsky_review.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_894e272259f94a5a94e41ab5bc2a145a.pdf?index=trueIn PDF document text
    • http://muzubosumewuxem.epizy.com/free_household_budget_template_uk.pdfIn PDF document text
    • http://tutedenomazul.epizy.com/34595325469.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_c19c6d0c588847868bcd691e6be6cdec.pdf?index=trueIn PDF document text
    • http://lowelomavojezi.myartsonline.com/76877891280.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/nokaj.pdfIn PDF document text
    • http://valirakasudipo.epizy.com/gugexeve.pdfIn PDF document text
    • http://lumalidik.atwebpages.com/lolazaxozemewolesaz.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_f678e12cac7d43faba19f6ffc2ba0a98.pdf?index=trueIn 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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 5536 bytes
SHA-256: 19e584228f6261178a27717980a065ac65f24f72a6b13518c60d770bdfad3742
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10612 bytes
SHA-256: 638c235f03a403a0a5f4e3d1788b7a24c8262c6a9340de5ee4aeb32ceb689939

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