Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4391a05a862ba08…

MALICIOUS

PDF

69.4 KB Created: 2021-01-03 12:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5f34fc8b01ac4266feb3aa08cce9acc8 SHA-1: 53a617b1646443f5516beb18fb938389b938817a SHA-256: a4391a05a862ba08c05ea3869df90c61bc0e17913b06391a4e800a7fb50e1015
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3 domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://trafficel.ru/aws?utm_term=best+free+android+mobile+tracker PDF link annotation
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/9a17079.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/a50fa7cda747.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/5939070.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/jhcgdie/pifera.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/774b547e5850.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/paxurudegibituvu.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/1475288.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/paxobuxebozuvanej.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/mivokozibu/safety_data_sheet_for_washing_up_liquid.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/razitusipigekowezez.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/49746764761.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/rinulexunafejujanitegi.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/jafas.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_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 5420 bytes
SHA-256: 9ca09171cc07fc2778ccfeb191a5bfdc47eb066b8c3006d6781332cee2648b39
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 10936 bytes
SHA-256: cee355005b89ccf0ffa910cd337b80ea36cbc39f0428edfb7868b92ea28c5bd7

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