Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bbad81f4e04e41…

MALICIOUS

PDF

71.1 KB Created: 2021-03-28 23:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be2f8597f0d23b71ddfa3abc69e9edf0 SHA-1: 0823fb028e41763f361777e66c28b85c32b9772a SHA-256: 21bbad81f4e04e411c5031ad8edce17e5b94a21f740d7018c02d354f6434027f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, indicating a phishing lure. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=h%2526s+mini+maxx+mount+6.4+powerstroke, which is likely intended to redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=h%2526s+mini+maxx+mount+6.4+powerstroke PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5fc57920550f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_603f90315cb5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_60064b60f19de.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/mierkhi/tiwefaloruxogavozujog.pdfIn PDF document text
    • http://cosmicgig.com/the_wave_radio_listen_liveto313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_60209ece28996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fd893d04c611.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/jgTjiic/launch_trampoline_park_membership.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fdd8965d15c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_6055f51d79061.pdfIn PDF document text
    • http://kukepagodapopa.iblogger.org/geramojijatupumofu.pdfIn PDF document text
    • http://boevoenlp.com/48849078101dmebb.pdfIn PDF document text
    • http://memilarud.22web.org/nefemitipopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_6052c717837b3.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/jiRhbia/wegosafaverilivujubexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca863982-1836-403c-b714-59b55290fc2c/grim_world_necromancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74eadcc0-9cbf-4590-8168-b06eb49523bf/top_200_drugs_brand_generic_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a57a2e2-c25d-4892-932c-40f032e96a78/kiwibedarotutib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fcdc2d-8337-4369-bf2f-76f7e7dc2d22/tewemejelug.pdfIn PDF document text
    • http://midelex.epizy.com/baby_message_tone.pdfIn PDF document text
    • http://pigibotokaper.epizy.com/18624554138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d89fe6e-4018-4dc6-a9c2-cf8bdf35cc28/dilazunufenul.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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 4116 bytes
SHA-256: 05e508d20c8aa6fa975d8efd51cdeca6e8fadd78af1270999e493b416deb98ba
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 11012 bytes
SHA-256: 841a1914ac479b9590d864e91c603ae242c528461432f8851872f4409dbfdac1

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