Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9d7a2379337a93…

MALICIOUS

PDF

77.5 KB Created: 2021-02-06 14:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b9238ec8b2e05cc1464c4435089c4ef1 SHA-1: eb55e60c3a9c98033466d12d4c63325d9747aaa4 SHA-256: 8d9d7a2379337a936dfd9da61576ff10474d156df2139f741c67accb99438f9a
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 campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

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://leonvi.ru/aws?utm_term=punjabi+wedding+couple+dance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428083/normal_6006aef4776bd.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/badaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd79e0f7152c.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/jukisuxawexu_zifubudevam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5ff531c3ed036.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/Ijbhhjg/99811414864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_6001da45bfb4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447107/normal_6011e52dd0bd6.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/fd8012ffde70ed9.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/bihL5je/reborn_dolls_silicone_black.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/c3ihOJJ/63932102532.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/ihhagjN/ice_crush_2019.pdfIn PDF document text
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/surusit_venosagegiwita_luluguxideranuz_girodikime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_601b0af71177e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 5276 bytes
SHA-256: 899914281b3699d8b781d42d557acee2336748564457d6b31aacea740c31c0aa
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10384 bytes
SHA-256: 3bfb50c56d154e9d15af06d2ada6830f2f8ed60888b98dea5b330d5dca6d0f6a

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