Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0066cd8ff223656…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 22:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8e1703435d38d21daca350d37b662a2 SHA-1: c6f70c2f95253162de452125e3ddbe95eeb5acc6 SHA-256: d0066cd8ff223656a9ad28dcdf7b219d52ed84df20f91177f44815caab7fd9d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/uplcv?utm_term=mitochondria+in+animal+and+plant+cells PDF link annotation
    • http://zygzak.eu/foto_dane/wysiwyg/File/78914408870.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/latazejozegebilefez.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/vigone.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/viguwulakuloxafokif.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210903050017357.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/24261680479.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/nowenarumamidejepefe.pdfIn PDF document text
    • http://jn-zhsc.com/upload/55885045824.pdfIn PDF document text
    • https://vatlieuchongnong.baohohoanglong.com/userfiles/file/pakubuzonawarivobukasixa.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/2037301333.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/jovaveg.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wupaxekap.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xalusofozeliriritomotuvo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/vusuzanoridusasak.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/78127241220.pdfIn PDF document text
    • http://kite-surf.sk/files/94815182945.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d08cd6a32a044fc464cc92c27cd2b0e9/68649089585.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/4909464734.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/K1iHUsah74amAuM1.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/56595833592.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4m5m9sftd4mokkhhnnhvb4846o/bejipukawezil.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xumojokijo.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/71061383279.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/49715145502.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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 10772 bytes
SHA-256: fc23ffb79d8cc87e20d66f6f5905de607c528c02b9c174513087b6aa375b3a52
font_01_sfnt_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 17460 bytes
SHA-256: 5c1f959910d5d0ea82691c7e167b49924bd26836bfeb850b3588fc66cc450d9e
font_02_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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