Malicious PDF — malware analysis report

Static analysis result for SHA-256 3993dc8293230f53…

MALICIOUS

PDF

60.2 KB Created: 2020-12-24 03:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 947387808227f87042b8edc1fd25e8ae SHA-1: 79e1a86088fde42d2773c526b9bc6900b7ce8c2e SHA-256: 3993dc8293230f53e7cc34febef6fc9b4fe568cb14c33590708334339cf1620c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK'. The document body, though heavily obfuscated, appears to be a lure related to a barber shop. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=cutters+barber+shop+nacogdoches+tx In PDF document text
    • https://junenewawaxi.weebly.com/uploads/1/3/1/4/131407408/rumumomajeduwadab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f8fb42743ef6.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/3834895.pdfIn PDF document text
    • https://tufuziboserivu.weebly.com/uploads/1/3/1/6/131636644/be7b2316.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/guwikakewotinosi.pdfIn PDF document text
    • https://dotobepe.weebly.com/uploads/1/3/4/6/134680180/768091.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/kipuguzirujeme.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/pafut.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/5099248.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/jihrACy/black_friday_deals_black_friday.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/pawafafuvojinize.pdfIn PDF document text
    • https://cdn.sqhk.co/lodesejidi/Zgi0DRl/vorazutaxarifubilifiwumik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5fe3f30d1fdf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/777966de-8106-4096-ba77-2b9257d8504a/muwiturefirofubotedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeeaa2ee-ffc4-40c0-9e18-f5f7cb6afbc4/34096545675.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_off0000afa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 5416 bytes
SHA-256: a3ec79351a32bc08c0fb82794542e494775a17542c734bd6492f825ad06133e7
font_01_sfnt_off0000c1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 9896 bytes
SHA-256: 6dd4f88609374d4c540029fae9a4f7c2d6919991c6a1c2720b505631b15d8d6f

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