Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8140b38049e5364…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 19:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c5c0ad2ba84108949aa33b48a3640bc SHA-1: 2ea35a853dfa44659b405abd389379155dd88077 SHA-256: a8140b38049e5364e76273e43c266230c4839c39657c1e71b1688e2f77976cdb
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of JavaScript points to potential client-side execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=life+2017+full+movie+watch+online PDF link annotation
    • http://konakelektrik.com/userfiles/file/mavapabimasajexikiru.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/jamajawilafek.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/vuvapemodepaluzo.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/785960092613b412b4951f.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/xilizirojubojapovala.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/perabuveriv.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jakawivukefekuzisobaje.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/pobijilefafuzubexejugov.pdfIn PDF document text
    • https://korankertas.com/contents/files/20822599289.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/foxemarijefove.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/binete.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/pugasup.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/513b3a3d4e49dfe448914e47bd6f1e09/7816257911.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gurafosav.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/82340823845.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137873fe906f---materakasotolefaf.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/tuzitukoripogomofiwud.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/juxuvesanepuxerepufi.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/39483953892.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/kagorugiva.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/79118145759.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/tijobigoli.pdfIn PDF document text
    • http://cecev.com/stockages/files/pinugeda.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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 17352 bytes
SHA-256: 7e294d4402f2d84809001dfa5302dbca5b17a8fb1f5b8646d4789db696e3f3a9
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 10884 bytes
SHA-256: 476a4803f6bc9bcab477df2555b63e39ff536935e064e980d0fe43af26d46eea
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1