Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c3d1b0e2045bfc…

MALICIOUS

PDF

79.3 KB Created: 2020-12-04 16:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6e1042a69ef7075237c1f3e78fab7e08 SHA-1: 9039897f380a8a473910d5561e79413b54fb5443 SHA-256: 40c3d1b0e2045bfc8b4f9e5237b559ba40bae851f31f88496dcb2259a0d68a53
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=uil+state+track+meet+2021 In PDF document text
    • https://warakamaluxib.weebly.com/uploads/1/3/4/3/134378328/juriru.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/budanananu_loxafiritoset_bunupazowagul.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/fozotak_nupanulatenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fa9bbe1f17fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5f979b8c9b9c3.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/varoximu/hexadecimal_to_binary_conversion_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6111ce-4c26-4692-a995-d05064700c32/kibisedagemowaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e619eb-8cc8-4e52-98f1-7850c6584648/mubewefufezarezekobaw.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/pagoxabeboku.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/formal_letter_uk_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0796330e-5b08-48a8-b9e4-d41d6c392e0e/summertime_saga_mias_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a1cc7e-6348-49bf-9cc1-0c9768da6878/soposevire.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/louisiana_search_warrant_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/9995335022.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_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 5328 bytes
SHA-256: 814fbd5f4a32114be0d4f99fda1cc7f70d1596a277f4b75eabca03db6b7f9749
font_01_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 10740 bytes
SHA-256: 1c5e9d0a4ea63ef36f0d5a40e87d21a7c2cd4d15281179fdff590895772a2ca3

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