Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c56c131f796bb88…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 20:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6e020fc8218de643fba8fe6674219dea SHA-1: b32c854b932bddf88014bf05ec1bf0bad3fa2948 SHA-256: 9c56c131f796bb88f60f85a78eb58df08cbbf37acd54ab7d0fd5f22d8faf9d4c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded URLs and the PDF structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=klipsch+r-10b+owners+manual PDF link annotation
    • http://pemizirevubel.mywebcommunity.org/jimef.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/55946095885.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/rent_stabilized_lease_nyc.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/all_network_topologies.pdfIn PDF document text
    • http://xonigej.mypressonline.com/97741495647.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/petigovetofefe.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/70750364876.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/introduction_to_psychology_syllabus_yale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_48f04e44c9394d38b77e24fc67fb6251.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_12c6b5e4f5d14186980a2c39011370d8.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_67b97f03eb9f45a58d540d5a8d611a49.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_8a85adc88ac44d08a71a7b01df1c2b68.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_7eefd799ddb64238851d5acb7fc7315f.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_e1d4e98e0c814a6093dcf65322b69c97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/kuzeponomerukazizefexida.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_644d95ada38840c78a73ed7afc6891c7.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_5095577e8a7846489892aa485dc1fa56.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_6020a797d12e4a13a5bbf61bf22940b8.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_177ab5c05669431d9f8f7f60a5fb93d8.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_ed88ec512ecf4a7f9a2643680360e8b8.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_7664854770964e039544f7325cdba602.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/bisection_method_step_by_step.pdfIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_f8076e8ebbf4414fa057381fed0cecfc.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_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 5600 bytes
SHA-256: 438e112f9f0087c9b535be16a1f144a9efe1d99c213e33a24e69cd0a72b3d18d
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11472 bytes
SHA-256: 1def5724d84b3cb1f2d7a0af990ce05363246065910fd5adc4a37ac5b39217f2

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