Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c75954f9330c3a…

MALICIOUS

PDF

100.6 KB Created: 2021-05-16 09:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d2ac61812ad122e8d698c47dba324562 SHA-1: 2613554f114bd74d587d8a545d87d99ab3fc5af9 SHA-256: 99c75954f9330c3a670ea2118f5d9bca7506aed7459d5330663e1fbc63825430
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=wasatch+county+fire+district+facebook PDF link annotation
    • http://malespw.xyz/likopobzxub8.pdfIn PDF document text
    • http://my-credit.info/jesus_calling_sarah_young_devotional_todaylqku0.pdfIn PDF document text
    • http://comp-arenda.site/fijojilatziq8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_606da3893f472.pdfIn PDF document text
    • http://vibomolivizim.iblogger.org/kanekuzuwivere.pdfIn PDF document text
    • http://mrshadow.net/72750742203f8sng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fe691d96539c.pdfIn PDF document text
    • http://buyfastedcircle.xyz/78314136307ndhyv.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/26221535360kmrcu.pdfIn PDF document text
    • http://usesoda.pro/poxivuy4up.pdfIn PDF document text
    • http://lngcliente.com/3085212946324x0h.pdfIn PDF document text
    • http://raisinshub.pro/jevobamoxovojedaksr7v4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_606e65b8206c3.pdfIn PDF document text
    • http://tersq.space/bose_sounddock_series_1_remote1u2c9.pdfIn PDF document text
    • http://zootime.store/how_to_stop_kidde_smoke_detector_from_chirping_without_battery9a8dz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewiwoladizot.rf.gd/wururofiw.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/national_geographic_magazine_september_2020.pdfIn PDF document text
    • http://lapamapifutul.epizy.com/what_does_an_internal_auditor_do_on_a_daily_basis.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_off00014a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2C 5396 bytes
SHA-256: d2418f185bd0d039b9ea56b4e7cf9867918796fe12af032236b79062e9ac3aea
font_01_sfnt_off00015c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9A 11804 bytes
SHA-256: 8602b058ada32a141e04d89d67f16e2d8779ef8b58cb2df02007e39c97fdbf7a

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