Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aa2811fdcc7b14…

MALICIOUS

PDF

120.7 KB Created: 2021-02-23 18:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cca66f31b628a937df478d49ee2e12c0 SHA-1: 0bf5bd4a3eb588c0c62065718f4ec810ac0cbcbb SHA-256: 79aa2811fdcc7b14fc7f7e55d6b986c80aa90fddbf8f8e2591ffb7a152e1e03b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment. While no scripts were directly extracted, the nature of the link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=yy50qt-6+wiring+diagram PDF link annotation
    • http://helpcontactform.com/taburukegejiduboritelubklsy5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fe6a1927cbd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6013c16c34cbd.pdfIn PDF document text
    • https://jipukikibowema.weebly.com/uploads/1/3/4/6/134633032/limuzini.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/V3haheY/disassembly_3d_free_download_pc_windows_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_5fd865359208f.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/hc7jbhb/best_shooter_games_pc_online.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/p08UgdX/48575923147.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/eheherW/uber_eats_orders_sign_up.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/bhcVgcW/splash_potion_of_weakness_xbox_one_minecraft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367940/normal_5fde85dc1ab1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulilubanis.rf.gd/html_linking_css_stylesheet.pdfIn PDF document text
    • http://gorulilul.rf.gd/affinity_designer_crack_mac.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_off00019b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B39 5668 bytes
SHA-256: 597839b9f6803c2e56f0692d4e2a1645c21db8dbd2b6b68e7215001ec5baa46e
font_01_sfnt_off0001ae97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE97 11432 bytes
SHA-256: bcc5a290335bd660ab73467f16cb3c1ab79327f9c8593ae92bdcadf03532ae90

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