Malicious PDF — malware analysis report

Static analysis result for SHA-256 539ab2553d424ed8…

MALICIOUS

PDF

77.3 KB Created: 2021-02-15 06:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8c8fe56584efab617d48bd81b600cc4 SHA-1: 431f236b8eb3343f19cb93183655176d19c75113 SHA-256: 539ab2553d424ed885bfaf7a862d99598105d65281eeedbd1edaa82cb632427c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farming heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=how+to+beat+castle+defense+upgraded+track+2 PDF link annotation
    • http://mediaverifiedbadge.com/call_of_duty_apk_mirror._net8q6sw.pdfIn PDF document text
    • http://organize.shop/nilonejijab2xsk.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/41632690068hcpzu.pdfIn PDF document text
    • http://mists.space/razonamiento_verbal_ejercicios_resuen28k0.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/great_powerpoint_design_templates.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/83680635919tnrha.pdfIn PDF document text
    • http://optarfes.com/download_insaniquarium_deluxe_3.7.2_mod_apk1k9zk.pdfIn PDF document text
    • http://smirno.life/prince_of_persia_apk_uptodown4j02v.pdfIn PDF document text
    • http://bas-vorota.ru/amazon_photos_apple_tvun1vl.pdfIn PDF document text
    • http://jumofusifabezol.66ghz.com/31043137352.pdfIn PDF document text
    • http://mikrotikwizard.com/94510943695pvlmm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namavorudil.epizy.com/59705529721.pdfIn PDF document text
    • http://gupevaworekupa.rf.gd/genaxilovikovoran.pdfIn PDF document text
    • http://nimunofat.epizy.com/jijulelikeruserawoji.pdfIn PDF document text
    • http://ketaxesam.epizy.com/dimuwunekojiwotabus.pdfIn PDF document text
    • http://daxizupalapa.rf.gd/holliston_town_reporter.pdfIn PDF document text
    • http://runodeb.rf.gd/53812298796.pdfIn PDF document text
    • http://poradenojipedu.rf.gd/extent_report_using_testng.pdfIn PDF document text
    • http://roroturazukixij.epizy.com/4873041847.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_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 5712 bytes
SHA-256: 2804a6f5d4c181485e8de67335d71bb4d764f88c1228686eac7e2c7a102e3503
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10448 bytes
SHA-256: ea362a84e7da7639ba6d84182847e25e7d468fd56abbc1af90652845350deb8f

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