Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd1269e81a76cab…

MALICIOUS

PDF

70.6 KB Created: 2020-11-25 23:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8f2756dd1a1d1d46accda80bb10965e5 SHA-1: 969cd5e1b8ad5321023867940e37a245d36a3c3e SHA-256: 4cd1269e81a76cab207e4f529b68017477b37f6611e9121015c72f66229fcb3c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on link farm domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=c%252B%252B+char+to+string+conversion+example PDF link annotation
    • https://bepikasubezitix.weebly.com/uploads/1/3/4/3/134325559/nanugufazapuf_xapusij_jupenofavizad_negosi.pdfIn PDF document text
    • https://xazujojupise.weebly.com/uploads/1/3/4/4/134493550/fukubugugigubozajuxo.pdfIn PDF document text
    • https://gikudinok.weebly.com/uploads/1/3/4/7/134730402/tamobugarefib-jubifalonoro-vavivemukujag.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/f9932301a514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9f6325-5eb4-4b38-bfad-9efe585a82de/manual_de_servicio_lavadora_whirlpool_parte_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390cdd90-2a3d-4505-98ba-8a688fc5e3d6/60552653289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc72bd0e-763e-472d-9dd1-768b0994a409/jufoxegiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3c2469-a6c4-4ca0-b56f-cea17a234514/49962277595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bdda66-31ca-4df5-9f8a-89049523fb3d/vumoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e41a7ed-27d8-437a-9c3e-d5b73e54ad94/malvolio_twelfth_night_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebe0acc-c8d3-4665-908f-43701d2b1a0e/labipojozixokabasu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/27898320980.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/79307461911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776a946a-6ac0-46e2-a715-9be580d12231/21201493033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0addf8a-2ebb-4387-a424-7da4e9a32460/miwukumajoxunotogade.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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 5380 bytes
SHA-256: fd833490d63d5676290f1c50f184e17534224651a46a7410be995661d6eef734
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 12232 bytes
SHA-256: 0f1668c6896731b2dcedbe103fe57bad0695ae5b17723d6dda598d90777fa1ba

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