Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf8eb434034e59…

MALICIOUS

PDF

71.3 KB Created: 2021-02-19 22:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c64d86a023bc4de6ea907d9fc15b97b3 SHA-1: a8e479c2bb2542bb6e01263fd43c5dc5607b3bfa SHA-256: 64cf8eb434034e59fc07722e74e28989e26a7926fbc72f35837c1f66f044df7b
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. Several heuristics indicate this is a non-clustered link farm on disposable hosting, with one URL containing a UTM term that suggests a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via the embedded links.

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://jacksth.ru/123?utm_term=the+republic+for+which+it+stands+audiobook PDF link annotation
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/filajox.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/408a2.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/jutubanuzopejunu.pdfIn PDF document text
    • https://midupupivubol.weebly.com/uploads/1/3/5/3/135343472/441b48e0.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/EVnjb8J/background_remover_best_background_eraser.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/ggDdtie/12928835208.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jfmNZjj/empty_lightsaber_hilts_for_sale.pdfIn PDF document text
    • http://tixomuwenape.22web.org/26475784621.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/XeAqiAD/424790806.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/dhehbHW/92097833294.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/87926257779.pdfIn PDF document text
    • https://cdn.sqhk.co/bimowikosaru/meFgcif/majorobirunegaforesur.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/5727336.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/3nA4Vsu/bus_simulator_original.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/3706aed4.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/6559446.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/hchciKR/lego_hidden_side_paranormal_bus_3000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 5488 bytes
SHA-256: aaf800d177a5ca190dbfe0462251ed1f0ab07db188fb9e8e494e25e51b1b617c
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10176 bytes
SHA-256: 9387ef0b93fe904af1f698078bd38d4ee79bffb1832e74c24b783b801d3e08b7

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