Malicious PDF — malware analysis report

Static analysis result for SHA-256 826a13820bcd9894…

MALICIOUS

PDF

77.7 KB Created: 2021-01-05 02:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 98bcf985ad11bbeb609e814471e0c17e SHA-1: e3f9bbe4dde5f9706acbd5483c65c43135a2d37a SHA-256: 826a13820bcd9894b8521d5be2ce4497ad779bcdea77b16d92322ed0b295c599
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document flagged by ClamAV as a phishing trojan. A critical heuristic indicates it uses a social-engineering lure to trick users into installing a browser extension or update. The embedded URL 'https://trafffe.ru/aws?utm_term=probation+performance+review+example' is likely part of this lure, aiming to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffe.ru/aws?utm_term=probation+performance+review+example PDF link annotation
    • https://kidodekorabatet.weebly.com/uploads/1/3/4/3/134320193/xusakoxogarulomu.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/830b5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff2671d1a471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f89eb26e1f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5faa389fa5142.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/CVpha14/voripifotetotubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fd6afd151c38.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/nedijowewoded/kubuxilajifozo.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/bisuf.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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 5344 bytes
SHA-256: 7e32653de6251373c73fe7d808e1763427af81a7776995916e8849eeb4bb7094
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10092 bytes
SHA-256: d28f643fed870f51ff61338f2397169b8b1d57dbfa44fbc1b7c4cadf101a24ec