Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04026dcf00e80fe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 03:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22045c7a848f86e79b5f80c314607991 SHA-1: cfe0d919d57225f26b7b6106f955d8dd7c2069d9 SHA-256: c04026dcf00e80fea1e738909cd1e41bf2860ed3541326356b8f34ac722ae09d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of a malicious document suggests T1566.001 as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://inwebjor.ru/uplcv?utm_term=thinkrolls+space+apk PDF link annotation
    • http://sakesushilakehavasu.com/uploads/files/gokixirebazegupu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/63940257532.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/bomonunedazugumoluti.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/renamomim.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/goxogikenixanoniredunajov.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/bajujejewazaziwanepetusu.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/28975812507.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xatewijip.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/71574937100.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139086e96d81---retiwawodigezafiresobefu.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/56260482927.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/lolexiraliludoz.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pawixivolebagiwafabobu.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021092103503873499.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jerajuxuwimumato.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/jonijazuw.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b253babc3e---rekega.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/farerasutigazako.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/dakodojubasu.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/10450827015.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/46111533213.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/kawositonavogibuzori.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/likuf.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/mobuku.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/64958712054.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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10428 bytes
SHA-256: 9d802dd84f4a277cacf03e10721a0090774de942c8c329303eaffba6aeb784bc
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 18192 bytes
SHA-256: aa1cc5e3c1707be56e51b53e8e200c1d1b28345e0d214691d9fb2ecf31d241cf