Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c55fb6070d357e2…

MALICIOUS

PDF

69.6 KB Created: 2021-01-01 23:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8339044e45ba1304210da436f3579649 SHA-1: b30bd891f3e8896534ffdf6423e5fee134ab0fe7 SHA-256: 0c55fb6070d357e2471dda36bd9bfcdc8705a612262cba4aa0b786e003c9339e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/123?utm_term=pathfinder+shaman+guide PDF link annotation
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/1441117.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/7958041.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/eb4fc36aafc2.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/nevovumowa/call_recorder_app_for_blackberry_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/baja_california_norte_mapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184e0130-68fa-4649-b265-f1aaa7d5889c/toxituzul.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/answer_to_interpleader_complaint_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3a858b-8a1c-4f9a-9ee1-bf0853ccc172/tonosixikaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf6cc51-b36a-440a-aa8c-1ce77e223549/distribucion_de_frecuencias_acumulad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adce278c-e795-4050-b5ca-ead1cb93cf10/gafanunadik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76dbb66d-8473-4063-bc2e-1c7fb9e4b7eb/torkom_saraydarian_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92523f7-948e-4790-ab09-6f3335f9b739/rosuripujine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0836b527-3caf-455f-8305-1eaf00e326e1/75818327078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22adffae-11c5-448d-b78d-76685bee4fa4/fusuwadamegila.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/american_standard_bathroom_faucet_manual.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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 5292 bytes
SHA-256: 9942ea67da793e147f623d997b0e9e5d0ba946bb62a8c2a3679d91c11a9fbfdf
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 10588 bytes
SHA-256: c188a8862fd9fc9d46a87d915c3b33a69a1a40a5701c584f5f34b610bb057cec

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