Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd907fd98aea5757…

MALICIOUS

PDF

73.7 KB Created: 2021-03-27 14:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72a22649cab975984c81e0510849dcc6 SHA-1: 263a8ea7cdef4cd8e62b09e08ee77b8a1e4c090e SHA-256: bd907fd98aea5757a46274036784db873e1e1b5132cc89043f388ebe373cac30
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, suggesting a lure to a malicious site.

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://soxebez.ru/award?keyword=urine+catheter+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497110/normal_60112ccd1b3d0.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/bose_acoustimass_15_subwoofer_repairp82zr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_60370f3846d0a.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/vDqTihj/77623943965.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gfKJz20/31521880743.pdfIn PDF document text
    • http://zumbayuliya.online/how_to_print_from_phone_to_hp_envy_5530ech5z.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/8628370.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/b21f881713c70f6.pdfIn PDF document text
    • http://mmamba.ru/divogefovoraze9oy01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443341/normal_5fc78db3758f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_89c4d5a574d64cc28dd4b9e742dd81ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/87595509151.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_b9c990e99994490a97eb0bc6f466c278.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/roriramoku.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/paluroropepafi.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_49ca521bbd6a43129861ad7a9a4e1a40.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c3c926c77c544c6e8feb070c02018696.pdf?index=trueIn 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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 5024 bytes
SHA-256: efbc00978441ba4f8f5b171298934e96616163f50c926637dcc43a65c16757df
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10376 bytes
SHA-256: 7491c54fdbc5b44e10a4a354eed49a942a4bf6f1736af2d2e0fa5cb8ab59f3f8

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