Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb79bbabc36efb7…

MALICIOUS

PDF

71.9 KB Created: 2021-03-04 08:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03421cc41aa6dd737a24f04652391c74 SHA-1: ab23f548d0886ecf8f9164a03f6407fe6f01f108 SHA-256: 5bb79bbabc36efb7521183f4619ac9451dc0d7090a6e42031227ee31478f7c4a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic specifically identifying a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous links suggests the document's primary purpose is to redirect the user to malicious infrastructure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=rare%20hereditary%20skin%20diseases In PDF document text
    • http://nebemor.mywebcommunity.org/66255685031.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/gifiijj/tinidumikokajawa.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/lafixuj-katejimelawi-pobulidu-befopadirujo.pdfIn PDF document text
    • http://harmony-market.ru/dunedin_rates_information_by_addressn0kmm.pdfIn PDF document text
    • http://bristol-yalta.run/67442300704blwd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_60407154c7518.pdfIn PDF document text
    • http://power-guard.shop/2966284305987u44.pdfIn PDF document text
    • http://zotaravaka.22web.org/sujozekimiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_602bef6d6539f.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/nawagovidajepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_603759f713029.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/6pjbhdi/bijem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodireso.epizy.com/machine_learning_cheat_sheet.pdfIn PDF document text
    • http://sinejelubomidi.epizy.com/10701005401.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/breezin_guitar_tab.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 5052 bytes
SHA-256: 95f641923f14524937fcd412b6deb7ff611532df572f5d44b79ce5d99badbea5
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 10388 bytes
SHA-256: ee2abc0e675ef8db4c5b08e86145f12483b415d5d9889390864281de2f47cc83

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