Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b38241b9044ba4…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 03:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b13edbbd4bbd2c96d785fc280ca969d SHA-1: c7f03bad2192ca7a31f95144ed35dd6d531abb78 SHA-256: f6b38241b9044ba425d901068351802951a429dd7d322c3bc3e5624512c08f8e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its small size, image-heavy content, and the presence of an action trigger. It contains numerous embedded URLs, suggesting it's part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://psychologkmalinowska.pl/ckfinder/userfiles/files/pogesiriwakigulufukuliso.pdf In PDF document text
    • https://vleek.com/uploads/files/todevejuk.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/ruputumesukevoxadopigas.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/saliseganeg.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/45156027721.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zutetotaxip.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/79hpk1ls2vme90ubuklojof8o7/28484734600.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/45384519895.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cda5c0ba1a163d64c5682053e62a0fd3/17305479824.pdfIn PDF document text
    • http://resttour.com/images/userfiles/files/wajinokazak.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/koxogarusebawarenogeno.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/virakakulaledumubedojaj.pdfIn PDF document text
    • http://tiquital.com/documentos/file/99645495685.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/dudevugosamenurunesejupuz.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/21374066374.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/legipemipaxegudewiv.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/6245200662.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/59279975371.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/mexegokemulazogosutubim.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/99855745291.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/mojup.pdfIn PDF document text
    • http://emeat.ru/var/files/wozok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=odin+not+recognizing+phone+in+download+modePDF 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_off0000accd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCD 13980 bytes
SHA-256: e93cf96235e59d2d1f7cf7fc2f4de27cf015a66b0112eba6b800e9b7ca7b21cf
font_01_sfnt_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10964 bytes
SHA-256: 76fc1b5fac94bc4a7031d9f150d6f3727de7a72ecf6606c0492357a62839ad48