Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6df1f2f9ed5379…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 15:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 711a94a8ee5c0c363830c22dea594261 SHA-1: d75b369341793a0858ae9e94cc5a92b0393f9a14 SHA-256: 2f6df1f2f9ed5379f7d5da6abd83aa7ace2cfb3f7416bac075e0c0b7a7fe251d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a link farm designed to obscure the true destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hhoasis.org/app/webroot/img/fck/file/sawizulijul.pdf In PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/kumaxuru.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/86432480635.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/luxoduzulomewis.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/sukapevevuzulale.pdfIn PDF document text
    • http://tencanpowder.com/d/files/18034427495.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/18725807763.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/rezeloroxutolirofowizet.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210911172902.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/56449088480.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sulizozutonin.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/mebaz.pdfIn PDF document text
    • http://dd-eng.com/files/files/tidagureluxoriv.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/75121076477.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133373bc5882---mavurebevufavo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e8135417---69426848442.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/kemudoduvibujibesetuf.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/20296000820.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/20710608493.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/darowokibatimilibi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/13124678810.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vopofuwosado.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/22535553206.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/99585635028.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/2120485761.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/21927426355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=money+heist+season+1+tamil+dubbedPDF 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10812 bytes
SHA-256: bc399cd98b72e2c6e20d6ef3f687f6f2ab3418b6d6c5ffb54d93469fd5434306
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 19112 bytes
SHA-256: 69ced4a040a8b87e3bdcd92425b9728db3ca0323f548f2d4d4ffe1591bf1ea50