Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65f684b1b1241bb…

MALICIOUS

PDF

73.1 KB Created: 2021-03-08 19:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: beac2318629291646024f6eca770da73 SHA-1: 3d596961dfe1be18d74406e9908834a9c6f80617 SHA-256: d65f684b1b1241bb1580aaa5cbd359b7da2fa8ce7b77826a18b50e3fcec468fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jacksth.ru/123?utm_term=general+knowledge+trivia+questions+and+answers+australia PDF link annotation
    • https://cdn.sqhk.co/zetoreli/uibidhi/movies_on_netflix_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jhfjbgj/62858007789.pdfIn PDF document text
    • http://therarbooks.com/nidakutabufuzp9dc7.pdfIn PDF document text
    • http://winoraama.fun/zijukuguq7.pdfIn PDF document text
    • http://supernefritroller.xyz/jejawujisoz8nncw.pdfIn PDF document text
    • http://geesecam.com/mitrailleuse_12.7_russe2x5xh.pdfIn PDF document text
    • http://dalnoboyi.xyz/183931205985np2t.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/0hjgjhc/radio_flyer_wagon_with_seats_and_canopy.pdfIn PDF document text
    • http://mybiol.site/xport_bike_rack_manualoybah.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jigWNfk/war_strategy_games_online.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/hvac_troubleshooting_flowchartkdjbb.pdfIn PDF document text
    • http://shtangye.xyz/523478713546ywh6.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gehbnja/78823641649.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/gdihwid/sitepa.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/hNFvDI1/mefofedalomitorakimitipa.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jcn6gdL/ringworm_fungus_treatment_medicine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ratixifo/rodugagup.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/45777856411.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/1285277886.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/dosenozadituse.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_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 5368 bytes
SHA-256: 7b56e0ff708c160a25bb017aa9b7196d20d352a51d1f9833eccdf9bb3a796354
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10856 bytes
SHA-256: 628c4b7e30a988fb1937b27491b836fd7a439b307cfb83095d1a53bef4b9dc74

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