Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47692317fd2eadc…

MALICIOUS

PDF

75.6 KB Created: 2021-05-15 14:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 60602e7dc2789d1beb1781ebd25d6fee SHA-1: af28471c03bbbbe29d00becb0f17fedb79d3a19c SHA-256: b47692317fd2eadcd79102701d055f1cc6dc78b4aba0465017003275953268c2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URL and link farm heuristics point to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wb?keyword=subway%20menu%20calories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467274/normal_6059a57a12dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_604a9461047ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5feb0187c9771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_60315be5cc64a.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/j7JMje2/39222897644.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/ghzRIgi/natapogobesudiverutuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/fjhw7gc/dekupewemaxezatosapakow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_600082ecbc3f7.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/gW9ijhg/32840043629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_f76b095fe65f47a98a827a4f52ff6867.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_9742892bce554429be60ee71d67b3e29.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_193ca1ac13bb40e8be71def84efcb57e.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_46eee72fb10b4317ace652853b061ac6.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_efd6acd1c27d4848b85696e57c2fa4ae.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_ce2581982f8c4c52a7a1463551b6771d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/savalegi.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/wonulisedofomuzer.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/axure_rp_8_crack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/samsung_55_inch_tv_mount_screws.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_5eaf54555f904329ad5e87f1d880803b.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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5380 bytes
SHA-256: f1d3726673d8e2e6a959617c3496842a35f5a44cb05205a0580ffdee2616c9ce
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10784 bytes
SHA-256: 7b465a7fe44e99d4a191c3cd33680518d7e7b51c45aa9ec1466ace3934899aa0