Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b9ddcd924f2cbc…

MALICIOUS

PDF

90.6 KB Created: 2021-02-04 00:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 430e566489b6ba5c63a4f732729d6350 SHA-1: 187cee2ff01f6d2a3ec999dd7354b5b43a5ac112 SHA-256: 98b9ddcd924f2cbc7bb9ed4c084a6d8ca5cb1ed1a63f4d4cb91e15f96252181f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or scam attempt. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a redirection mechanism to further malicious content.

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 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://baarspo.ru/123?utm_term=honda+b+series PDF link annotation
    • http://usersonlineguardingsettings.site/gta_vice_city_motor_ifresin7t35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_6019301f7191a.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/fenexu_limumexajafelu_wadetewar_sagunubuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_600b6ed4a8e15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5fe09b6b047a6.pdfIn PDF document text
    • http://likelid.xyz/samsung_s6_manual77lxx.pdfIn PDF document text
    • http://reduslim-officialsite.site/73053269669zjpuw.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/jeseratugunemofi.pdfIn PDF document text
    • http://shopwithsale.website/54459183353mmaup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5fd1fb00ac545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5fe823e914c0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_6005bd59f2934.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/jupevixumivudiduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366664/normal_5fe5aaf554766.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/0a3784.pdfIn PDF document text
    • https://jebomifodav.weebly.com/uploads/1/3/0/8/130874614/wikeluf-notosed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_60172af3239df.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/pesetufavo/website_header_design_templates_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/aarti_sangrah_in_marathi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000129bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129BB 29228 bytes
SHA-256: 1f7fa0aa5b13e39474ca3dde779bdff21746dfaeba2e85d6357abcb8d3ba78e4
font_00_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 4888 bytes
SHA-256: b272a68d84cda9d3d03484f66ecd8162707beda938168e87d9796cb669119152
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 11552 bytes
SHA-256: 7ce5711f23c3342b840c4463192663bd9062d8bbc70ce936b46c787d67913622

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