Malicious PDF — malware analysis report

Static analysis result for SHA-256 d140eb78903be65f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-25 17:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d2f4937f1b4e47eb2e672a9dd738624 SHA-1: c19cdb27d8425ba72eeb4fb0d176b9f3ca3def20 SHA-256: d140eb78903be65f7999e053e0c8ae3cf7b84504fa95e381c113fa7ee14a2d4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, which is common in phishing campaigns. Although no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613987586a002---jakoniwizomipojug.pdf In PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/zumozekukatov.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/gabofik.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/dejupezabugim.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/baxutafuzunobotile.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/7169367260.pdfIn PDF document text
    • http://space-edge.com/upload/files/86386913744.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/44038160036.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///niluxosojizabi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bbba2817bd457984d96902bc8383d475/48233324581.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/nijibuvivikunobiniso.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/jilokupogom.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fifimetovafevokuzulur.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/zokamikagefezevuteno.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/lusetiwirulafavun.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/54613368715.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tojar.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/9280526852.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/fojonifejoxokiz.pdfIn PDF document text
    • http://manu-transport.com/documents/file/wuvojinak.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/69121548850.pdfIn PDF document text
    • http://exima.kr/userData/board/file/dexanivowilebaj.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/81856405818.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/98631411231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=desktop+computer+watts+per+hourPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/28696425929.pdfIn PDF document text
    • 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_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 19216 bytes
SHA-256: 893e455cf59e6106b5b912ff79da894d29e24d69dc7aa61046569c3d8d314937
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 10676 bytes
SHA-256: 632fc573c55b39b0c0b66d7eeda27f822733415e21573994d39f0d8ba24b219e
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1