Malicious PDF — malware analysis report

Static analysis result for SHA-256 1792dea1bdf29034…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff4dc1f9c14985fdb24fbea4c0a6bdbf SHA-1: 2572d204a4e6baf38fc38853cae6bcf8b85c980e SHA-256: 1792dea1bdf29034c1f92331d581b699c2af0c3c51351549aba9d9d3e315b8fe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links to various PDF documents hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://resalured.ru/strik?utm_term=el+dador+de+recuerdos+ver+online+espa%25C3%25B1ol
    • https://wixilasiniwib.weebly.com/uploads/1/3/1/1/131163505/14137230614d3e7.pdf
    • http://feremujidonigu.getenjoyment.net/sri_bhagavath_geetha_malayalam_text.pdf
    • http://xosubowavenu.mypressonline.com/wabidofizus.pdf
    • http://ziwavabewite.66ghz.com/57122299525.pdf
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/5129949.pdf
    • http://dexizixefufene.iblogger.org/27842219817.pdf
    • http://loxotuxer.22web.org/74700050857.pdf
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/8980377.pdf
    • https://wuvepadin.weebly.com/uploads/1/3/4/7/134714831/nivazuna.pdf
    • http://nupesupo.mypressonline.com/differences_between_public_limited_company_and_private_limited_company.pdf
    • https://bapajoronugenig.weebly.com/uploads/1/3/4/2/134234589/telodas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vuxawov.rf.gd/kafojibofesapubuwetesidep.pdf
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_f066d33d2e6641008714f42176f356b6.pdf?index=true
    • http://keluwuvofaj.epizy.com/lewodedenofororiza.pdf
    • http://mafofeguf.epizy.com/anais_nin_little_birds_download.pdf
    • http://mivizuganax.rf.gd/79735352865.pdf
    • http://silijufomil.epizy.com/biometric_attendance_report_software.pdf
    • http://feselipalez.epizy.com/48175418483.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_0b0b137a0ad14dc6bdd5d2dfb5204ced.pdf?index=true
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_e86559e5dd83417394d5c14d5993497e.pdf?index=true
    • http://safivobuvap.epizy.com/bully_obb_1._0._0._19.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a6.bin
8f1b1b32d5955906edc373162d86844d836e6e4e4928e5b312655ba9e0eab7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 5296 bytes
font_01_sfnt_off0000f37d.bin
f49628af92ae14228792f557bebc16966160081f95df079d9fa18205ade14704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 12512 bytes

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