Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6f99a4be9a99d7…

MALICIOUS

PDF

79.0 KB Created: 2021-04-03 07:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 508db6d42511c5de7c77fa17da145915 SHA-1: 0c5e561334c0b42787f7a5694b046ddbeb6d4fb2 SHA-256: 4e6f99a4be9a99d747128116848a8b2227fffc2111a4b3974a44fbf56b058e03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are embedded within the document body, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users to external URLs, potentially for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=yamaha+rx-v863+specs PDF link annotation
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/1062148.pdfIn PDF document text
    • http://hyipinvest.site/4705974900qssvn.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/4851654.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/fWBjaVm/gagekalago.pdfIn PDF document text
    • http://fredo.bike/durango_wildlands_beginner_guide3su5v.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/5pjffBz/2020_formula_40_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/8jjicji/25583543805.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/IhfFxhe/baby_monitor_iphone_app_motorola.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/QjjhcCv/83309532592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_569e319c9b0b4c878f0e219469ffee9b.pdf?index=trueIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_56d6a114559349829adf060b78108176.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_19a9202ee4d341e685c4c03277466617.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_6f012b5fd02244c6931a620522f9c2f6.pdf?index=trueIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_1bb21995657d4564b4641f4e083f842a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/77267677654.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_e1caffbb181e4e93a51280b0b89d08a2.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_b7a9fbb367204eb2ae2993bf8fa2dbd7.pdf?index=trueIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_5c1dc96b1a9541dca146ab46484468ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/cpr_guidelines_2017_pediatric.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 5772 bytes
SHA-256: 5a0e3d0f5a31b6e3317b21f92bc83e72c4f03c103dafd191d0384c08cc1b1955
font_01_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 10332 bytes
SHA-256: fbb0b13bfecb3f26435e091ccc4c0511d179ad255bfdece8d8c2f30f0acce65a

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