Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc349b2fa722012…

MALICIOUS

PDF

73.0 KB Created: 2021-03-27 14:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 77755b81eeafcf318c0fec0fcb6866bd SHA-1: b1dea6dc6b9399075c435af010b334bef8e1c65b SHA-256: bfc349b2fa722012df53b2e7fa46b22fe23606b9e79772fe76e1853322c35fa0
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate the presence of an external URI and an SEO redirector link, which is a common tactic for phishing lures. The embedded URL `https://maypoin.ru/strik?utm_term=fight+club+book` is the primary indicator of compromise, likely leading to a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=fight+club+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fdef21f2f3e2.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/radefe.pdfIn PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/pefokojatovut.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/telem_kubijaxidujukul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_6018398fbebc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_60365d65b0b00.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/gFjaoJ2/t800_cyborg_vision_arlington_va_22201.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/e3bb701.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/3Wr22xp/wogizaf.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/1476904a-caa0-4efe-a1dc-847eda333de7/deepak_chopra_7_laws_of_spirituality.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/ronebobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da4e339-9051-4ea3-90e7-c7ee23cc796f/does_kerbal_space_program_work_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b01dec-35cc-4355-beca-9cba6d5c41db/tepigudamadubujotudane.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/reporting_mental_health_concerns_at_work.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/dilibekepuvadarakavolo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/117101203.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/arsenic_poisoning.pdfIn PDF document text
    • http://fenulujexita.epizy.com/convert_to_word_adobe_reader_9.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/gebarasilores.pdfIn PDF document text
    • http://rapudipawuv.epizy.com/46414123005.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 4736 bytes
SHA-256: 1e670d124bb444ea0f1e3cfe2bc0c08ebf4a2984d114f949abd8122c6e6d9399
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10888 bytes
SHA-256: 08d9ec364b35e9258ce7cd1e86f739cda7e09eddf111c3d29509ba4e287e5e0c

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