Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec8157105bb3b8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 17:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abacf99b27fddb3988c9ea0ac5150c6c SHA-1: 99a4217cc6f6e0fb08d2cbfe4263f315b9df5be4 SHA-256: b3ec8157105bb3b8f74f0a06f455d526cae3643facf755738e00faad612a6859
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with a high number of external URLs pointing to various domains, likely intended to host further malicious content or phishing pages. ClamAV detection and ML classification strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=pokemon+storm+silver+rom PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d66e66e66---86097365015.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • http://guowangcable.com/d/files/23669191905.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091708225199.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/xuruzexenemep.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/29565349147.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/82149307523.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/99055524748.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/jotadaje.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/34333113306.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/10364597705.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dubanodedojow.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/rudodizitij.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091221304273499.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210901160304.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395eca88cce---pelanudegedadavekuk.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/rozapesixib.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/10738629245.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/puzofuxobozowuwaxurux.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/tolafafujovedarip.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/87644284119.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/viraripasuxepoxutub.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/pibad.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210905202411_4wxv8n.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///lufuwijodadutiferoxutamid.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914063605.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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 10268 bytes
SHA-256: e8074b5c89b1a56e703f680886a63cf6ecdee73a71cc48441dde298be70968ed
font_02_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 18992 bytes
SHA-256: 862a537e813ce275dbbd19cafea50b3b150561d19d48cb2594417d22dcd72a04