Malicious PDF — malware analysis report

Static analysis result for SHA-256 4755d8f39006062b…

MALICIOUS

PDF

72.9 KB Created: 2021-02-25 01:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 412032659b2c709a1bae8fa2b28da1f2 SHA-1: 70c8b83b3497c260cafa2319f8582cc866cb159a SHA-256: 4755d8f39006062ba30047c0d1f64cb551236a8279bc5a957e44c89d60898697
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards a phishing or content-luring attack vector, likely initiated via spearphishing.

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 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.
  • 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://jacksth.ru/123?utm_term=mini+cooper+hidden+menu+codes PDF link annotation
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/gedaleguzikuvafagak.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/rezeronipalun.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/jofotiliwesajivu.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/zofapebuzerawi.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/nesurot.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/lijirur.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/jjE4OKr/vezevivuda.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/8229259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/star_trek_into_darkness_cast_carol_marcus.pdfIn PDF document text
    • http://ratofozobafizok.epizy.com/ripit.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/google_fashion_trends_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/33595348501.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/anarchy_acres_treasure_map_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/51956102998.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/63326390243.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5076 bytes
SHA-256: 1d44541e18a52fff402a606bb76d798185631368e041bd3b2561f82b3c995de3
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 10968 bytes
SHA-256: 2278f3bea94289b10b240c8ab2f997779960ef2373c39d248832540b0582e9ed

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