Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa193535e800e2b0…

MALICIOUS

PDF

85.9 KB Created: 2021-10-10 17:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: db2286ca014e673fe6e8be7c9aba5fa2 SHA-1: facf09fe08fcfa91919c02928f7142a1e643057a SHA-256: aa193535e800e2b0631dfe82746a167e7182dc4cce7610f07246517ba8ab2fd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=cover+letter+examples+data+analyst PDF link annotation
    • https://canoe.ro/Extras/ckfinder/userfiles/files/damutagufanarul.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/26807762587.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/tivasikutamapimemuker.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/godinoweluvamakikekepe.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/58554642788.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158474b87cbd---64371995375.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/pelavoseri.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/13084038890.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/27307835589.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/53683207407.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d03f3ef1---71300109111.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/14284949936.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/52448486783.pdfIn PDF document text
    • http://maksimetall.ru/files/26424883654.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/lubovoj.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zokesurebewuwidazukugi.pdfIn PDF document text
    • http://hanifeugur.com/image/files/74958284928.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/36882460977.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f12762fb8d---dulejakatanurivegejedo.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/80264313542.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/93877353755.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/nolizipabuvefelawota.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210920201051.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/manuxatepuzaxezuw.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/31093889883.pdfIn 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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 18940 bytes
SHA-256: c05bfe042dd0ea11d27bb95270a236cf1c1747ef40b5a2129dc1b228a4961466
font_01_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 10772 bytes
SHA-256: 7f38dc82c02fe5c5619097b8b8113d11446c3f2d74ad89d8d6bc1eb09ee8c626
font_02_sfnt_off00013ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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