Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c43ebd008bf822…

MALICIOUS

PDF

63.6 KB Created: 2021-02-22 12:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8d4d1ac6e51745ddd2975d23f2519bdd SHA-1: e78f597968378399da6a08ae513898ba92c2b7fb SHA-256: 36c43ebd008bf822d8c3a21ba834f018091a6d71dac6076116f05683010bdf56
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=lakshmi+ashtothram+lyrics+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495058/normal_6026885fe6ae2.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/jiJhc7D/winking_lizard_independence.pdfIn PDF document text
    • http://trackcreditscore.info/how_do_i_print_a_monthly_calendarno0ks.pdfIn PDF document text
    • http://believes.space/bizonevinukexakusokituvojr2e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_5ffe8ad6aeb13.pdfIn PDF document text
    • http://kieverts.xyz/regoxorugamijozilibejupew42ndp.pdfIn PDF document text
    • http://lollipopa.online/nopadipizinosazi0h3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff69dd3c945f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_602a8162e2006.pdfIn PDF document text
    • http://dektesheff.xyz/tepunivibilaxisute4m1t2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5ff82f3e689e5.pdfIn PDF document text
    • http://mscgis.net/jusevufetaduninojuju5xbpz.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/iyqidic/39179832592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_5fced362d38d4.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/xhi1ryU/25683497427.pdfIn PDF document text
    • http://hackins.site/what_is_a_neuropsychological_batterynkirk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6017502fa3144.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/uNjrhhJ/gacha_world_mod_apk_android_1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 5144 bytes
SHA-256: 92f5f2cd3b40fa38b922e87be47af3a5ae6fa41fb11ddfe332d31c3ecf61b554
font_01_sfnt_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 9780 bytes
SHA-256: 33f4c3fafb167b4e6abc73622b02c5974469a00393c72008d161109d2abe1ded

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