Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddaf2153cccf52e…

MALICIOUS

PDF

71.4 KB Created: 2021-02-04 16:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d360034755c1df6a86ae0b4217b7587f SHA-1: 59e3dab3761e8b0a8302a1d181f9f39645320786 SHA-256: cddaf2153cccf52e506e67f494c7dff325f7f907414a09cc2baffb93f69227f8
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link farm attack. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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
  • 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://leonvi.ru/aws?utm_term=formato+de+una+bibliografia+anotada PDF link annotation
    • http://fb-copyright-help-from.com/87195148792iwwsq.pdfIn PDF document text
    • https://piwupibuzidiki.weebly.com/uploads/1/3/0/7/130739867/4626081.pdfIn PDF document text
    • http://fitokapss.xyz/tiempos_verbales_en_espaolljdoj.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/zuxalodas.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/7912275.pdfIn PDF document text
    • https://miragojed.weebly.com/uploads/1/3/1/6/131637546/padibafoluba-gisate-tevadojor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5fc62ba05eab1.pdfIn PDF document text
    • http://magnitoli-2ekran.site/declaration_de_cession_de_vehicule_remplissable17dqo.pdfIn PDF document text
    • http://selectgetc.top/argumentation_and_debate_13th_editionmk149.pdfIn PDF document text
    • http://businessoutsourcing.info/renaissance_periodization_free62ewr.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/gdmmiji/55736319691.pdfIn PDF document text
    • https://cdn.sqhk.co/jetekujob/SheRgd9/58014274237.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/egijjIM/53618474017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulibekesewek.epizy.com/christ_church_secondary_school_uniform.pdfIn PDF document text
    • http://xewebumobodoris.rf.gd/momentum_investing.pdfIn PDF document text
    • http://vofaxov.epizy.com/mutosonabifezuj.pdfIn PDF document text
    • http://gamupuzif.epizy.com/61660853418.pdfIn PDF document text
    • http://jopiwutipav.epizy.com/ruzabobodezarotezude.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_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 5144 bytes
SHA-256: cb10bba3000381b4278e4aba9720fbf27890503f9b711b959e8e9fae730812c9
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 11636 bytes
SHA-256: 6ec427e65646d3b9c56027f6a082ebd953a4a707bf40e44f65e38bfe26ffa28e

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