Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aced2bfadd6d2e4…

MALICIOUS

PDF

68.0 KB Created: 2020-11-28 01:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b42750b913f3b81724cb37f553ab989e SHA-1: 7313764e89c7774492da7193ade6460c7b7e8266 SHA-256: 8aced2bfadd6d2e485d50a61a12db5da10dad715c8fe9806dde0c3b489b1153f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing (Chase bank). It contains a large number of external links, many of which point to redirectors or unknown domains, suggesting a link farm or distribution network. The ClamAV detection and ML classifier further support its malicious nature, likely involving exploitation for client execution.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dokakida.weebly.com/uploads/1/3/1/3/131380589/8454220.pdf.
  • 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://traffnew.ru/aws?utm_term=structural+difference+between+rna+and+dna+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5f9f018c396c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5fc17700e3ca8.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/8454220.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/4954c3bfc3ea051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5f975fe07ef42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f8875d388899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fb85c044e6f6.pdfIn PDF document text
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/c39f0ba128.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/cdc253e.pdfIn PDF document text
    • https://fujireroxilurig.weebly.com/uploads/1/3/4/6/134649353/9462105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408996/normal_5fab403ba714c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/214d258b-d96e-4c61-b932-625d8bbc9f45/les_paysages_urbains_ce2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8a9cfc-1500-4c18-bb03-851d3810cce3/lobivobaxagisejefomavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73eb502-cb2f-444d-9828-cbafb2a27fd0/57521450759.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_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 5508 bytes
SHA-256: 9aa4f623abbc2f3d075cb5b924696ee60ceb69fd5d59bdc5f4c9e776e0a59b12
font_01_sfnt_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 10576 bytes
SHA-256: 247c58797ea541944ebe7189948b91bebae4ceed83ac318ee2327ecba6ad7d07

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