Malicious PDF — malware analysis report

Static analysis result for SHA-256 52df95b6d5aebe8b…

MALICIOUS

PDF

82.6 KB Created: 2021-03-16 10:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0bde04b3902eced688355d1b91c3df36 SHA-1: b940f46df3cd9883fe7863ee8d286f0dbb33eeca SHA-256: 52df95b6d5aebe8b6ac9e4176c2b6422770035d9451d49d7fb9856a3cde9747b
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 0.9998

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://vilenefex.ru/strik?utm_term=what+contributed+to+the+cattle+ranching+boom PDF link annotation
    • https://wenojuzak.weebly.com/uploads/1/3/4/2/134265903/dorivuneluxe-toxugimaxoz-dowopikimi.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/tekobij.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/2003_dodge_durango_electrical_problems.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/risk_assessment_in_social_work.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/rokoluri.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/fofitovamavo.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/masebasawaga.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/tamar_dewit_gabuxojemugijo.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/xozuz-pusevapuririvob.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/d76898d0721e1.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/lefedobobudotuzapex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/18391594293.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/homeland_security_illegal_immigration_reporting.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/casio_g_shock_mudman_g9000_review.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/sijezukivepo.pdfIn PDF document text
    • http://mutidulofof.epizy.com/gps_94_answers.pdfIn PDF document text
    • http://guzumirofega.epizy.com/printable_t_shirt_template_red.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/shri_bhagwat_geeta_in_marathi.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_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 5328 bytes
SHA-256: 673235c75f9aa7e2343ddbe58b6f23e114f3b8ea8409fc494edffe46bef21de5
font_01_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 10796 bytes
SHA-256: 125afe57f454f1395ddc96696a31e975049c8016498b5bafc3d36dd047cc15c8