Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6359129493842a…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 16:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 96c7c175ea7abb409bfae35805c1ef16 SHA-1: fc529dfd290a1434d8ee9e0739e5df5a3fc1692a SHA-256: ef6359129493842a1fbd22e931f5b27a8e524ead6ff12012ab64adac1e257ad0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute links, likely for phishing or malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://ponafet.ru/123?utm_term=acc+aha+guideline+2018+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419204/normal_600379c68f4fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_603cacb34dffd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_6007399ccca76.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/bhagavad_gita_quotes_on_love_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_5fca0a48d0af4.pdfIn PDF document text
    • http://mgacessoria.online/best_introduction_to_computer_scienceyc6z0.pdfIn PDF document text
    • http://requiredjokblog.com/2964672673wwzxx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_603be57b904f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_60490f50e6deb.pdfIn PDF document text
    • http://zoo-taxi.site/pugoguqpvlw.pdfIn PDF document text
    • http://pinerapidsrr.com/498600126290ysj5.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/metixog-nuvelevogovez-wovazugero.pdfIn PDF document text
    • http://amsidisi.xyz/what_crimes_give_you_the_death_penaltye1v9m.pdfIn PDF document text
    • https://rugadugunat.weebly.com/uploads/1/3/1/6/131606951/c3cf6d33e3.pdfIn PDF document text
    • http://merovew.xyz/west_side_story_musical_scriptdx0g9.pdfIn PDF document text
    • https://minebetedobipas.weebly.com/uploads/1/3/2/6/132696067/xuvum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/8828521389.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/toyota_camry_hybrid_2020_price_in_canada.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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5652 bytes
SHA-256: 52f6784b9acdaf73a2406b0fd1444c4a43e7882c9563762ea2624c181ac8f753
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 10976 bytes
SHA-256: 6d0393efeacb36557197401c2e478d90b526947764913639343f4f193954284d

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