Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd375cbd8f6cdaa…

MALICIOUS

PDF

66.8 KB Created: 2020-12-16 15:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c49dc7d4a8317388d98f7d03f0da78e9 SHA-1: ed3d3f5e3a25cd15fdcaafbfcf63e2457abdd1b7 SHA-256: afd375cbd8f6cdaaec39bb8f120181ca1a2dfeb3f5aefd1d612f3d49a47ef8e9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a link farm and a critical ClamAV detection for a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. These factors suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=graco+doll+stroller+and+crib In PDF document text
    • https://xedexebil.weebly.com/uploads/1/3/4/2/134235570/gafefiret-zesenokes-sefozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fa5eb39bde4c.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/251955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5fd6c6e934e0e.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/durorusevato.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/wutapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8d5cad9cfc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5fa189d040055.pdfIn PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/4180958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f935c998b76a.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/28e33ccd-13fc-4b68-8740-32c2668bc2d2/how_to_succeed_in_business_without_really_trying_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9877c07-6035-4948-90e7-4b6faff141c4/kusunewum.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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 5104 bytes
SHA-256: 8c2e1f726d21b66c588b4a01b60629491efcbc8884277d88986ddd7fcf6566dd
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 10688 bytes
SHA-256: 61cd1391dc2c26194f8a28f762f301111c00c7de86f4ae90ed0debfff34bdf9e

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