Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca3731b8964b156…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 22:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d94f3d9b2f10783f1cd9cd48e2a78f36 SHA-1: 8edc29e2562c6dcebfd0db5f2ab0e9966527e55e SHA-256: 6ca3731b8964b156f9849c9eb22bc65f06986ec6be78424f78049bdf8feaa69b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, including one that points to a password-protected archive lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://amindoost.ir/images/upload/files/lujapuzomi.pdf In PDF document text
    • http://ruihuitax.com/files/file/dedijojoraxubijidimad.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fii0nc1vrbi4eiaslf4fkbtiuo/lopedukuvanun.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/vesobokomalupe.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/kezoludokofajo.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/87449041144.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/34746011237.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/luxafupodobam.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/polijun.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/5146812052.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614147082b1b4---19624229530.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/4947129453.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/48882509531.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ponusudopapelo.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wixotojosuxefirixopofetix.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/82632377890.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/ralaramo.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/rodidudetufugudonifuso.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/forapowasodisig.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/85725919810.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210914032454-63248217943.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/siwimojuruguginadokegimin.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/dukolujapunis.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/04/zaxapofonigagejagitefowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=account+fortnite+generator+ps4PDF 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_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 17052 bytes
SHA-256: 0b69147801cb3de45483f82f1137d9ed81dd8fcab17715ba0f7740a14d42d2e3
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10768 bytes
SHA-256: 0eb9435244b32c58c025aa8f83c6c90d072d90d0ccf60e7c67328a846a0088e5