Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d480f86d6c77a9c…

MALICIOUS

PDF

75.0 KB Created: 2021-04-06 15:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 920257473697b54f78ee133e25c4d878 SHA-1: d6c6b401379724a4a5d022d29bea2c6099cbeeac SHA-256: 4d480f86d6c77a9c33b22eab21fdb3dde03606fba4c0d6c6b42ee4702cab5d93
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 and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://maypoin.ru/123?utm_term=home+rental+agreement+format+in+tamil
    • https://cdn.sqhk.co/dodanadofu/achdhhb/ludipov.pdf
    • http://thedopemarketing.com/222565833007oswy.pdf
    • http://fb-ig-violation.com/89744715764prtuw.pdf
    • http://mudikovarew.mygamesonline.org/ethical_leadership_journal_articles.pdf
    • https://fasipibopokele.weebly.com/uploads/1/3/6/0/136096953/jojewikemunafuv_ralexixeloma_rarojun.pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_60376844e97e7.pdf
    • https://static.s123-cdn-static.com/uploads/4377938/normal_5fcae849eb293.pdf
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/repekeje_lamimuki_zowiwu.pdf
    • http://likefetevu.getenjoyment.net/when_dimple_met_rishi_show.pdf
    • https://cdn.sqhk.co/xamizine/jhihfY3/best_switch_protective_case.pdf
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5fcd73e0e7a8f.pdf
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/7838190.pdf
    • https://cdn-cms.f-static.net/uploads/4388060/normal_604f0f42af390.pdf
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/9b4b9b402d.pdf
    • http://luwogexejel.getenjoyment.net/51078386589.pdf
    • https://cdn.sqhk.co/zezoxomop/d4ifjac/denigogabelagila.pdf
    • http://lalat.space/jaxebiwidi2a66q.pdf
    • https://cdn.sqhk.co/xuwifoviwalo/itjfMuk/38598489841.pdf
    • http://dressnbuy.com/kenmore_ultra_wash_service_manualzcpbv.pdf
    • http://euromarket.pro/war_and_peace_bbc_trailerqefxz.pdf
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/6935210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fakuguvil/11629861286.pdf
    • https://s3.amazonaws.com/gupojakami/history_of_english_literature_age_wise.pdf
    • https://s3.amazonaws.com/nitajosasa/duraflame_electric_stove_heater_manual.pdf
    • https://s3.amazonaws.com/bubeto/ruwawuwonaxilewod.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_off0000e91c.bin
673a9b9c4da13c226a41ff3ecac8af8f0e449ff15339f080ea3b4ad7edd37f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 4872 bytes
font_01_sfnt_off0000f992.bin
36d2d6ebba2e9a0092bdb4d74c632f1cbafc0aed4ea17b65766a285aba471d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10800 bytes

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