Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2574bfafda9ae4…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 23:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4803f5dea06097b2da26a7481c437e2 SHA-1: b1d79a6ca6bc8698eeef711388c5e14251cece8b SHA-256: cd2574bfafda9ae403e5a90669a4449c3afd77090b79dddd67a56b6c6389f625
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded external URIs, indicating a likely phishing or link-farming attempt. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious code execution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+use+2n2222+transistor+as+a+switch PDF link annotation
    • http://ntep2008.com/UserFiles/File/venimamogesetunavogipiwu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bgkm6ktjgvflh3tinmlimfn5am/biwigomaxeramivoma.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/nuvamo.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/banusogotizoboxa.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909202001844853.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/90750117922.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/54376405577.pdfIn PDF document text
    • http://innotack.com/userfiles/file/32250517380.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/25689271173.pdfIn PDF document text
    • https://ewt.cz/res/file/kafuwaluta.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/35815394494.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/29591099801.pdfIn PDF document text
    • https://maria-galland.ru/files/file/31392558304.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/wupeposumima.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/zuditu.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/44895880430.pdfIn PDF document text
    • http://eternaseguros.net/files/files/57431536168.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/25219319110.pdfIn PDF document text
    • https://kawanmto.org/contents/files/buxuveripopisi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427ec51b34f---bovaferej.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/35263971279.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pafodituzuv.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/disilobugedagad.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10580 bytes
SHA-256: e0f45ebc44c882280a7129fb2dc49e1c937cd69110f6099fece455682c51c2b9
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 20528 bytes
SHA-256: 24b3a21ecccbd4b95baa01c5ba397c317e15742d7a324dfbc075ab204a46d00d

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