Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0949822913a064a…

MALICIOUS

PDF

72.9 KB Created: 2021-03-28 02:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 489efc08034b20f875a5b009194382cf SHA-1: 683edcca57afac45c66715f6b539f50cea3866cd SHA-256: c0949822913a064a3c867fdb6553d0e48a1f947ee18358d2d5277f0e6e9564f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting an SEO spam or link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://xajibur.ru/strik?utm_term=color+and+light+science+experiments PDF link annotation
    • http://jogubewuzamofet.iblogger.org/afcon_2020_qualifiers_table.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/jigiFZd/events_this_weekend_in_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/1Ehi7nZ/cute_mermaid_simulator_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pabulibig/1Fijnqx/digikey_electronics_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/Dgewdgh/36493748344.pdfIn PDF document text
    • https://cdn.sqhk.co/nigigeje/dhfihhb/pelifusosarum.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/jghgDDR/88201112211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_605d9adf3158c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_604e6c96d3654.pdfIn PDF document text
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/fulogajakapul.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/5243a.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/Pgw79hi/the_inner_world_switch_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5fe0e4d6c9ffa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/nujegidezurilenidubuwese.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/jezuxosem.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/ralolibewupamezifu.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/pezefawadizozinibawi.pdfIn PDF document text
    • http://guvubaxi.epizy.com/webizilorimalusiwofadene.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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 5460 bytes
SHA-256: b301825c1f9f4b1da3129a65fda62d68674f2222641c085229aab05d07c41230
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10744 bytes
SHA-256: bce811facb2cd41e51207333d91251a7d163b906d70f95f4e53b83dd52f1bde9

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