Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafb9871d337250e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 22:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5554b3369dff381da6ba6fe020630247 SHA-1: 551553d86202936bfe0d3acb78812399505f5f01 SHA-256: bafb9871d337250edb9b976e176ac91eacd4684d9b32c069fc9f20732993aadb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'gimoguvi.ru', which is flagged as a potential link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://gimoguvi.ru/wix?keyword=best+caliper+guide+pin+grease PDF link annotation
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/9CjciaH/keresirejorukobudip.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/xiaibBe/two_dots_travelers_trail.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jejhOii/jojowudavuv.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/2751831.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/fhb9hgR/82408487455.pdfIn PDF document text
    • https://vadibuxazuxubaw.weebly.com/uploads/1/3/4/8/134855910/b81eedab7394c4.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/3117461.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/asymptotes_solved_problems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timeziso/92508648462.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/dunowezogudosawomufejore.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/bostitch_stapler_e66760_manual.pdfIn PDF document text
    • http://lavisekenesavof.myartsonline.com/vusunodonokumixogeve.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_9a9a40c2e42249dbafd2c9be6c2465f1.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_54ad2ab8a6864dcaab2bb8cf3d6fe3bf.pdf?index=trueIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_7de00fd5618941b38a790e86b65a7644.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_6b2f81ffe2bd4e7899c9b11646a37604.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/sistema_reproductor_masculino_unam.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/how_to_check_intel_motherboard_model_number.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_204b6ec516b2486ca48b170adebdbe0f.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_a94cb54fceb34b00a11d0931f6f62183.pdf?index=trueIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_d46dd797b482475badc862eae349f727.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_f5ae5433cd674863b9a6fdb4a20134ce.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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 5292 bytes
SHA-256: d8b4abad8245094b3dd1a4f417b1c74bd10ef65d2d2d4f4825905663620a6421
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10540 bytes
SHA-256: 65dda03a3c8ad96bf3651d13552fd1219fdf7423bb972c942cf67cdb0ef94130

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