Malicious PDF — malware analysis report

Static analysis result for SHA-256 c752d362266527bf…

MALICIOUS

PDF

102.7 KB Created: 2021-03-31 11:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 71f9d26ac75f04a442d00ee250dd0cce SHA-1: 3c8f7db307f5c73b966157e256c4272e089ff24e SHA-256: c752d362266527bfafb0f154a6d960c5f53782c1436562161e7a358e04be496e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://nipisod.ru/strik?utm_term=mental+status+example+pdf', is likely part of a phishing or malware distribution scheme.

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://nipisod.ru/strik?utm_term=mental+status+example+pdf PDF link annotation
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/55408df5c.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/bd9a8d53.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/zepenasubazagob.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/mojunuroxavames-xifalape-nolebevumeme-rinus.pdfIn PDF document text
    • https://posepopofag.weebly.com/uploads/1/3/4/6/134609660/bf92f90f72ae3.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/3c875.pdfIn PDF document text
    • https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/6435286.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/f68ddfcaf.pdfIn PDF document text
    • https://vepawedisekonok.weebly.com/uploads/1/3/4/9/134900222/xurovojudukusol.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/9047528.pdfIn PDF document text
    • http://beliyden.xyz/34731064916j9ljb.pdfIn PDF document text
    • http://auth02mobility.com/how_to_get_a_publisher_for_your_book_in_indiapjrbm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_5ec9ae54944d4f0ca45819677f554d21.pdf?index=trueIn PDF document text
    • http://setarazenit.epizy.com/nuzaneku.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_71f1331faacc4a578393e4b0b25a7f48.pdf?index=trueIn PDF document text
    • http://telenusu.epizy.com/excel_center_sheet_horizontally_and_vertically.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_off000156b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B4 5164 bytes
SHA-256: d69da9c44746e122ed78be3c07e0d0b3368807988f731f48b082ca14d6f5df35
font_01_sfnt_off0001684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684C 11628 bytes
SHA-256: 3905d1603502d6079f7edf0793651c59aaec9ffaa0ecbf74cc6910ca2c887a38

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