Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df901e5174fc7e7…

MALICIOUS

PDF

70.6 KB Created: 2020-12-31 17:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2ec2990d512f614651ce7882a127fc88 SHA-1: ee5ed339995ed2cf48832c3014ba8515747c9d31 SHA-256: 4df901e5174fc7e720593958b100ee8795c275e846fc7aba4d985cc6f9a6ec40
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to a suspicious URL related to 'gas space heaters melbourne'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=gas+space+heaters+melbourne PDF link annotation
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/5033692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417519/normal_5fe03433a5f39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392664/normal_5fcce5f067633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_5fd791b6541d7.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/pukaridimupo/29314199860.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/comparative_adjectives_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/guvusimeko.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/kaxikol.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/96565545279.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/keyboard_arabic_for_macbook_pro.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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 5344 bytes
SHA-256: db1e8bcac37178e17fe3c356df204d5c5dd47c459ebeb80cea5a54cb52a9224c
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 10700 bytes
SHA-256: 4a66da822bb1bd4b3363a0d0ac59877f3c0c6e669a66a5ebaa1c92178f071aca

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