Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb325d51e81971b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 02:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a24ac671f6bae5f6249888bb11e1ff06 SHA-1: 9170c9fe42267b90593434143488166c3bac17a3 SHA-256: 3eb325d51e81971bafa41e72140f954f40d9362cd25fc17924ccead3e7d8f98e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm used for redirection. The PDF's structure and embedded content suggest it is intended to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://studiopiergentili.it/userfiles/files/11371162492.pdf In PDF document text
    • http://virus-safe-zone.com/ckupload/files/wunerexivitijawile.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/65630628908.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/42801425272.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/vemugemiwakejoxig.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/kuropidubanufotasovujisur.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c31142af1---11245842256.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/44661497249.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910235735473831.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/remojamofaxudorotosepi.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xukegafabubiwuwubam.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/xebabubofomexu.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/vemudibanoj.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/zapigisanige.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/kinumijarezetaremadebefi.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/javoxem.pdfIn PDF document text
    • http://apismorava.eu/docs/vonudus.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/nevinolax.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zugokagota.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/43060621938.pdfIn PDF document text
    • https://viceda.com/userfiles/file/bogomisenaraberirukiwakal.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/65337688214.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/23153232069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mass+followers+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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 17776 bytes
SHA-256: fbab292904a4a8debec43eb5e47a05435826f4314e49adb462c3b29a20c93391
font_01_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10228 bytes
SHA-256: 80b933919503ea09dabd69aa4fd29f80095304e2609582a508b73ee2b6c2444a

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