Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bcd66be4596f2d…

MALICIOUS

PDF

93.5 KB Created: 2021-01-29 07:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a89de08d8da74162c6ab2767ff8e88e0 SHA-1: 28f7e950ebcc6f93f59a7fe687fb696acb4d9b93 SHA-256: f5bcd66be4596f2dfb6e7959881ca88b4a73c7a2bc0062d5da661111a8b03ad4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver malicious content or redirect to phishing sites.

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://druttle.ru/aws?utm_term=love+actually+ost PDF link annotation
    • https://xewuligatojijow.weebly.com/uploads/1/3/5/3/135395235/8359654.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/muwenav.pdfIn PDF document text
    • http://bestgirl69.com/elchronicle_characters_listxnhl4.pdfIn PDF document text
    • https://rarifipive.weebly.com/uploads/1/3/4/1/134131304/8878859.pdfIn PDF document text
    • http://site-shop.xyz/resumen_gramatica_ingles_b2l19fc.pdfIn PDF document text
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/nijipowozufexonaxi.pdfIn PDF document text
    • https://sibuvavaxo.weebly.com/uploads/1/3/2/6/132681946/5008722.pdfIn PDF document text
    • https://tafujopebipa.weebly.com/uploads/1/3/0/7/130774972/e3d10d6754b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_600e4d048a88c.pdfIn PDF document text
    • http://leqqurint.online/illinois_constitution_testu90h8.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/hungarian_dance_no_1_piano_sheet.pdfIn PDF document text
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/subijoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fdb1c3eb4cd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5fe17080b5704.pdfIn PDF document text
    • http://abreudesigns.com/73546294786o0tpy.pdfIn PDF document text
    • https://molavose.weebly.com/uploads/1/3/5/3/135350427/5227446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujesotes.epizy.com/xibuzexojaveg.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_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 4800 bytes
SHA-256: 07258d2156f5f98ae9d10d970913730542d82dd4b19d9fc2ee66e2651c6ada60
font_01_sfnt_off000141d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D0 11844 bytes
SHA-256: c3f42fd79302ca97f661db909fd92e4c72b50e1f8b8d3225b8b8a7b6b666976f

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