Malicious PDF — malware analysis report

Static analysis result for SHA-256 9918d115c958d71f…

MALICIOUS

PDF

79.8 KB Created: 2021-03-25 19:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8fc8a392f77667b6f6b5ff3f3831c25 SHA-1: d720e2f9808f852f06212d10334220118e5f4519 SHA-256: 9918d115c958d71fc551e8e74ba0b7bd1db82443e8d2d904e16379459c2761a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/aws?utm_term=finnegans+wake+lyrics+irish+rovers
    • https://cdn-cms.f-static.net/uploads/4384471/normal_6043f88dbfa2f.pdf
    • http://siviveko.getenjoyment.net/xaxif.pdf
    • https://xobisajak.weebly.com/uploads/1/3/4/2/134234638/pekizugavaluvope.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/2960ce1c7cb2c.pdf
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60113b0b69b22.pdf
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/fitobobekuromisolari.pdf
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ff448879a7aa.pdf
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/2ac238f8c14.pdf
    • http://takovevagagiv.scienceontheweb.net/business_letter_writing_book_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4413845/normal_6022bc444a299.pdf
    • https://cdn-cms.f-static.net/uploads/4457279/normal_602df7119d5ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zijivevip/badger_5_instruction_manual.pdf
    • https://s3.amazonaws.com/tapelu/g_shock_watches_for_sale_amazon.pdf
    • https://s3.amazonaws.com/zafaronivaj/ansys_workbench_book.pdf
    • https://s3.amazonaws.com/xapijifas/wobewesa.pdf
    • https://uploads.strikinglycdn.com/files/fb167a39-0a0e-4cd3-af9d-89195bb7595e/lolipu.pdf
    • https://s3.amazonaws.com/xamapebonijos/how_to_write_a_program_evaluation_plan.pdf
    • http://tuminexozuvino.atwebpages.com/jokox.pdf
    • https://s3.amazonaws.com/girilifawuxi/fopejegupuvew.pdf
    • https://uploads.strikinglycdn.com/files/78b5945f-6951-49b2-a686-78175798f057/vadeliguw.pdf
    • https://uploads.strikinglycdn.com/files/e4378d99-e544-4e40-adc7-f79a4ff4df22/33075496472.pdf
    • https://s3.amazonaws.com/genijusemu/48815883503.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin
797904a7a8d4ba5345b4ea8e97d5a013f6ace208fe8ec40a7439b5d4f248d262		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5332 bytes
font_01_sfnt_off00010148.bin
759d54cce1a57a3cc1d3a355ea4975071534d1efa62dc34cf5fd86cb39961271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 15592 bytes

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