Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40ab9aad855ee4a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 10:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eaa31fde9b40f460831483b665ef8109 SHA-1: 54ca810ea158e0b7932dc7e42f194c6c9ccae40b SHA-256: f40ab9aad855ee4a39ff2653f5db43b3f444668a2cde8a06a21655703cbf8e0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://tasivn.com/upload/ck/files/fonesirapevew.pdf In PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/21566848065.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210901123354.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53228190927.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/60761237333.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxegimibiwupejim.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc3e4314f---25027318738.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/74078148688.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sosojuzafoveko.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tisubewiji.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/84154871563.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/tojijozolonobidera.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/xadilab.pdfIn PDF document text
    • http://demkapi.com/resimler/files/potamavegutasenos.pdfIn PDF document text
    • http://e-menu.hu/editor_up/xabexowizifav.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/32200687635.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/zirowobusur.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/luforoget.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c7c8995ed714e5d2a123b47673a75ede/ludofiburapabifujami.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/bidanegetofawedadatum.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/62351607673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=find+by+androidPDF 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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10028 bytes
SHA-256: 11471168d48d9f6fd0521ff132439c75bd1a8c013056b3acca7b3427cecd89f5
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 17324 bytes
SHA-256: fb2cb572b09760ec2eb817161a813d494df335e5ced3f3b26dbb4e9a6fe61fed