Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f85b715651794d…

MALICIOUS

PDF

86.6 KB Created: 2021-03-02 16:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4c25fd69efc2cce715129e4ff9d20918 SHA-1: b1bb43f47e16fe72233d4d2e8f8b7be003856367 SHA-256: 26f85b715651794db84824b5b565f842f92c0f2c7d3a259d1d0c7c8eb200fe55
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

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://resalured.ru/strik?utm_term=what+is+the+message+of+the+story+of+an+hour PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485809/normal_5fee730f54791.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/lolaxax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_6032e1dff1dd9.pdfIn PDF document text
    • http://navalny.design/wendys_frosty_recipe_3_ingredients92c48.pdfIn PDF document text
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/pederazevorug-turitono-nudeluju-vejezi.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/wilofavogobomilabe.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/8733f47b4c0.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/what_is_the_average_salary_of_a_chemistry_professor.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/vavajasesav-wexikunasoza.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/jofem.pdfIn PDF document text
    • http://zugawumaz.22web.org/bhojpuri_hd_movies_link.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/15384df3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karajifaderiwow.epizy.com/baby_laughing_sound_ringtone_free.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_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 5264 bytes
SHA-256: 13e5c7c2aed87aa07ca53b2be29c5bb7cd5b6cc1575f758b5ac382442ea61e53
font_01_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 10136 bytes
SHA-256: 8ece4f37e605f79d2d98e3661df8715e396bdfa8f6949d472f90c6a27f9b3850

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