Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528e129c2d44d79…

MALICIOUS

PDF

107.8 KB Created: 2021-02-16 09:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d490cf536345cf5a19e915e15f178e79 SHA-1: 2902f16cf12dfcc45fad094305032473d463c23a SHA-256: d528e129c2d44d79ec14a9d3a5951fcdc2434865e85332f773a97ffb82a41ab9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=carl+jung+theory+of+collective+conscious PDF link annotation
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/8626379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_6003604631d15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487208/normal_5fe41f472393b.pdfIn PDF document text
    • http://forecast.bet/beach_buggy_racing_game_hackt8f9f.pdfIn PDF document text
    • http://magnitoli-2ekran.site/encadrer__la_dizaine_prs_ce2sgoie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404990/normal_6000b20acb26f.pdfIn PDF document text
    • http://shothard.site/pilirivajekadeteryi.pdfIn PDF document text
    • http://nely.xyz/108663648167598v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/alpha_broodmother_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/telapifofem.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/44190001845.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/fipaxeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/carnitina_2018.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_off000169ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FF 5288 bytes
SHA-256: a18769f68d31a18972d48266f4cb5d4c0f78a2fed595eabde3e3b5cc11bf89cd
font_01_sfnt_off00017c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C0A 11460 bytes
SHA-256: 16b1561be80cd95afcc20aacea60a7a29ea826b7ced61dd7f8cd562646273f76

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