Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1e993991e09f0b…

MALICIOUS

PDF

65.9 KB Created: 2021-02-22 02:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0bd804d8bf9de5b4bda5c5fad7bddad1 SHA-1: a8f6e1226d40997d6bbd0ca3f11682d1b05b56c4 SHA-256: 0a1e993991e09f0be9dca0236f326533c85f2739b85ca2b2f6b35c8815dbbb4d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it is a link farm designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external resources.

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://baarspo.ru/strik?utm_term=volume+of+composite+figures+worksheet+8th+grade+pdf PDF link annotation
    • https://cdn.sqhk.co/rilixuzewiv/ijdzthf/tower_conquest_hack_2m._com.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/jigdfq0/39976537864.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/jikogujaz-sigopokibutolik-lajezu-duwejogawid.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/6mlhgLt/nosenusuzutedodus.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/igcVTkm/97936685087.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/how_to_write_a_financial_analysis_conclusion1nrpl.pdfIn PDF document text
    • http://leafester.online/40k_ork_codex_7th_edition8upzu.pdfIn PDF document text
    • http://shoop-fe.ru/pentair_fns_plus_60_how_much_deku6m3.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/bJFgfhe/rabajato.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/tz7YhhD/57966232379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_600fbc0f54274.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/bigVjaX/hku_admissions_portal.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/Sxcghfr/xprofile_instagram_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5ffb5a58f103f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_602428584da7c.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/5286935.pdfIn PDF document text
    • http://bio-ita.fun/minutos_de_sabiduria_descargar_gratisczeyo.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/5249862.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_off0000c3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 5884 bytes
SHA-256: f135b56796e8e1527c989dd357eab0b265618107fb8fb5790184dd7ce8084f1c
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10080 bytes
SHA-256: 13d6ce5438e0e461d82539ffaba2987f0faea02ad65dd7958a9b9b66901a567a

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