Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb666dc2dd9ad44e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 13:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a6ad9875f0c0be153dfcad9cd80c64a SHA-1: bbff6bfe456ad42a1eeafac66aaf87810a195c63 SHA-256: cb666dc2dd9ad44e99abca31293696c0e98870f0766891195a4f3ddd0dde7040
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://ausafe.net/images/art/files/pepagarodinazisinom.pdf In PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/29849978482.pdfIn PDF document text
    • http://benetalent.com/upload/files/81623187050.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/96342393198.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/16357305893.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210917_025846.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/rogojeruxadoxatoxok.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/lutox.pdfIn PDF document text
    • https://rinducm1.com/contents/files/38728245982.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210912010208_9m9kmk.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/56095457136.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/taburar.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/wofatunurisemogejo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/63755830391.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/xonenopeletonajexinikefa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161341f439ae9f---39251496705.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/faxipajedegopikoda.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/75788527313.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/babugaminasuzor.pdfIn PDF document text
    • https://bfull.ru/uploads/files/66525131191.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/60661102005.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/31612843727.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/44706303912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+android+tv+be+used+as+monitorPDF 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_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 17692 bytes
SHA-256: 7d989925a368d13098da5e50396fc67793ec7608ce1ca86a63a7324f64bf08ac
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 10700 bytes
SHA-256: e9258fe3cf11bcc83233344371fc2807db1b376567be8785c7d60ca581686dc2