Malicious PDF — malware analysis report

Static analysis result for SHA-256 645a70af60ca5574…

MALICIOUS

PDF

77.3 KB Created: 2021-02-14 11:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8c952aba012afd8c4b321ab476ff578 SHA-1: 8305db4e9f83d7a4c8d6d83ddf964afaa9a40019 SHA-256: 645a70af60ca55743824a7af39054728e85295c6d244d86dfb4dcb95e9ae9033
194 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a potential for malicious redirection or phishing, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=oak+island+lighthouse+nc PDF link annotation
    • http://tokio-2020.fun/yo_robot_pelicula_completa_en_espao119u1.pdfIn PDF document text
    • http://ijmalan.xyz/tamuvutexosiffqn6b.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/nazuvadejepak_jilagolisumis.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/iiUjfhd/jikekaduvexoro.pdfIn PDF document text
    • https://tovorugezix.weebly.com/uploads/1/3/4/5/134599805/e2c05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465557/normal_5fdf7044634ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fd88ea52da6e.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/8323490.pdfIn PDF document text
    • http://unonatur.space/859052541588p1tr.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/472hczz/bloomz_tea_menu.pdfIn PDF document text
    • http://kernig.store/padi_accident_management_workslatecwy6v.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/pimepo.pdfIn PDF document text
    • http://gazzsheff.xyz/kotenasixare9gn5c.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/nobuvidaro_jagubif_ziroxuvi.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/341dc2f4.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/bc1a487f69.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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 5196 bytes
SHA-256: 40f2524b7a077f504751925c1a07df22084fe0b4d577187d58934a4f8ac9a689
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 11680 bytes
SHA-256: 7e9955a56d96ad53f2eaaf9306388892bd2f200e4d8c217ab1428080273f4ef0

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