Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0371cae5191b82…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 00:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac0372225631ab936da01c84e777ae3a SHA-1: d0c79067710dcc4883b2cbb40d80e1d645316c85 SHA-256: cb0371cae5191b82243ec59bd0b5641804b839012a08a39366115227334a70dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards an attempt to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=apk+football+tv PDF link annotation
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/99795883193.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/duzirovisuvaweripume.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/jarobuw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ca3b9225---sinefugevesire.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a7d14b2d300a01116507a069f616eb89/nujulituzexozifemirefanuv.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luset.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/80468671024.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210924191233.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/13535083154.pdfIn PDF document text
    • https://nevisnews.com/userfiles/fibazibuzanobogo.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092204202763.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/82486797823.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78476899412.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/81212781903.pdfIn PDF document text
    • https://mkontakt.com/dat/file/29565921519.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/68403789098.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/46605388678.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/47285444389.pdfIn PDF document text
    • http://woykoff.hu/upload/file/metopilubigo.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/79833735712.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/6080002350.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/fujoxafirapateviporot.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/95285487201.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/guxotavanafit.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/tinidekutapidejeretil.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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 10036 bytes
SHA-256: 03a6b91ed3cda16c73ddfddbe67ea5dde0aa4fcd5b46d680b1e4f5c935914b16
font_01_sfnt_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 16444 bytes
SHA-256: 122dec664c3ae643c1eacdc248be21ab7c2ec86955177498395352a36f4c1bd4

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