Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0d26b322845ca7…

MALICIOUS

PDF

74.9 KB Created: 2020-12-21 17:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d8af9acb74622467226fe21c50053a4e SHA-1: ad567b06ecd78e07a02f4044d4864e0fcd6b052a SHA-256: 2f0d26b322845ca7309a455dca7bf110b8594b962a27a652e3f646fdd8828fe0
186 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 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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?utm_term=cours+espagnol+pdf+gratuit PDF link annotation
    • https://kofufavok.weebly.com/uploads/1/3/4/3/134313370/jobupunezipolamu.pdfIn PDF document text
    • https://wosivurojex.weebly.com/uploads/1/3/4/7/134732329/gedolulidibi.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/7171679e9b8fde.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/gilifokopesu.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/zofobogelavofogunov.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/4f518f1.pdfIn PDF document text
    • https://puniduvete.weebly.com/uploads/1/3/4/3/134341297/fd44a146c2.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/276baf757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5fcff2863a00d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418379/normal_5fc3e41a7ace3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fca664896e30.pdfIn PDF document text
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/mulipixaxodibi.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/fadadedezeker/14627055892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864442bc-d9d3-4456-9290-c10dcdbc6c83/99959655728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fff276-7266-4860-8e5b-f276df61703b/81301079727.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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 5112 bytes
SHA-256: 3f044e9087c75fe7a75dc499c341b26eb0768966fc8de6d9d0e44ffd0f140dd1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 12916 bytes
SHA-256: c09c0769fe49893a8d371754efbde912fd5888e6a19e10fd86d8964fc441c952

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