Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47616b85f062d49…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 16:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb61ab7707201ca60175f1e58b1a5907 SHA-1: 91a9b2c24d602f744007f84e50f7940bf3987072 SHA-256: c47616b85f062d4901144bccf4c6553606e04e9ae931f520031710892a591a25
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external links, suggesting it is designed to exploit vulnerabilities or redirect users to malicious sites for payload delivery. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ebd.su/UFD/7623/files/teporuderawumi.pdf In PDF document text
    • https://safehouseservices.in/fckfiles/file/mojeluben.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/japowijiwuzoxexuvujabig.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/vedasij.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/guxetaxub.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/xinujagolixifa.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zixifezo.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/85980455709.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tugokesijenunivazeneluxew.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/jupezoganuvuwumemofowi.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/mamuv.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeba9cf882---legelegekanapuginipara.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/lopirol.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/poxozunazux.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/fevafabem.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090503481773499.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/zuzexazegasukujilo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/tidolorojalakuru.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/51810789264.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kikedupisokozavedivod.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/tozuz.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/mugozuwizasesole.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/21488386082.pdfIn PDF document text
    • http://poiskvod.ru/images/file/pigenexegokijekikoj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/78564522640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spirit+box+communicator+apkPDF link annotation
    • 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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 10700 bytes
SHA-256: edaf89932ed7ee1f0345740317d4d2fc644ef9a4d85cafa349ad3e22e4a15c26
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 18184 bytes
SHA-256: 374aa97a5ee23ef7289304eb5acfa3de0051a1c0d9997899aec633c362527a6c