Malicious PDF — malware analysis report

Static analysis result for SHA-256 a351a87b7f425679…

MALICIOUS

PDF

74.3 KB Created: 2021-02-28 07:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b725b83fc57d0c1ef07fa528dddb4d13 SHA-1: 2ae30d480469d0919cbedac1db13f275dcc1e0f6 SHA-256: a351a87b7f425679f41438d2f4cfc09cc56b1c50a751644470c88dc8e062f94c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to technical documentation, likely as a lure. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=wendell+odom+ccna+200-301+pdf+volume+2 PDF link annotation
    • https://cdn.sqhk.co/tenokesime/Lhg5hx9/tapimenonegesomevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_6004a440a58f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_5fec8dc25fed2.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/19830d024d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_60175c7a9302a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5fe6b18d42835.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/xuzel.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/tapirozonomerov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_600c43aea6197.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/ijXaijd/84987759587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_601a254a898eb.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/how_to_use_crane_drop_humidifier.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 5376 bytes
SHA-256: 88c99b4d3638566833aef9d305bed282c33ad7368ea734f203c2611025df9931
font_01_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 10240 bytes
SHA-256: bd90d59829fd8b292cc34cf1aa7f258c63b38f2ddd91a7cd4a0de80a0f951dcf
font_02_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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