Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfc55caefac09a7…

MALICIOUS

PDF

68.0 KB Created: 2021-09-12 10:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3692482220e850c6a672adacc220db5 SHA-1: 324b905115e167efc8a303fa95482b878c53aa1b SHA-256: dcfc55caefac09a73e698ec8c49e86c748b31b6777b7124dd4b14d7daff14ace
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://panificioilcavaliere.it/userfiles/files/sagerinawufif.pdf In PDF document text
    • http://galluccifaibano.it/userfiles/file/41915161004.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36962541859.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/solugoxosukafivedexu.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/sepilimikigarotareda.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/wovenedodosuxisug.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/79240897920.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/16887831708.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090508150680554.pdfIn PDF document text
    • https://cardolf.ro/files/50232579217.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/82207296002.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/26987440859.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139807b91cbe---jafusefawop.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/d9279e.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jegawojujuwedogeduz.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tizivole.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/pebanuredu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98b6e3afc---dogatuwigesarujosevi.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/12406082348.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/mugofetorudozawuwufepifu.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/tiguredu.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/64301745494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dj+erycom+app+downloadPDF 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_off0000add4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD4 10648 bytes
SHA-256: 0e02e0926280bdb016b57db322b0fb3997e5b58e43123a387277dc3ab86cfc1d
font_01_sfnt_off0000c641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 14480 bytes
SHA-256: 93c45b2add8124b47d4bd2809307721f48f8bcda998f3bd24faf89b8f72a650c
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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