Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d86593e3d39e25…

MALICIOUS

PDF

70.3 KB Created: 2021-02-15 01:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b25e23bd51a4b589b69fa4e6053b772a SHA-1: 0a5d45532ef92d93f6f45e2fbb1bad9509d48878 SHA-256: e5d86593e3d39e25837e7f1a7c4f34e1a97063286573a3fdbfdb542fc260c4dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the embedded URLs point towards a phishing or malware distribution scheme, 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 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://jacksth.ru/wix?keyword=mutant+genetic+gladiator+mod+apk+2019 PDF link annotation
    • http://xazutakivad.iblogger.org/pumepatubig.pdfIn PDF document text
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/157c431afe9.pdfIn PDF document text
    • http://pedujagafena.22web.org/31754505046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fc8116160ad8.pdfIn PDF document text
    • https://pegigisujojefuf.weebly.com/uploads/1/3/1/4/131413718/8874504.pdfIn PDF document text
    • http://quickstore.pro/74862180206q2sa7.pdfIn PDF document text
    • http://help-business-media.com/drivers_log_book_template_freean421.pdfIn PDF document text
    • http://english-10.site/paul_dawkins_notes_differential_calculusx19k7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fca62632086f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fff56feee074.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/wutapulopap-tiwusupus.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/poresi/xokibubu.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/zuwiwut.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/tajefaruzidatix.pdfIn PDF document text
    • http://jipipazed.epizy.com/4780809293.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/cute_whatsapp_status_video.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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 5764 bytes
SHA-256: 0df173b4047f5c3733b0e76f5deb8ffa745fac8cab55a3d17a57a4ab2601d282
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 10212 bytes
SHA-256: 6a381af8228152f9e7a1aced7f459cd69162c230bae3739ce29afc2f1d5fc617

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