Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce41328da470792…

MALICIOUS

PDF

88.5 KB Created: 2021-09-09 00:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31a0f21cd79553b64acb303c174ebf66 SHA-1: 9879c855a755b808cae5ecadf32d99345f4e2a48 SHA-256: dce41328da47079247216af823d3069a13e35f64859280261db178aa5e12adf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely delivered via spearphishing.

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 https://archism.ru/uplcv?utm_term=conquer+silver+club+ios PDF link annotation
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/rabajavalegolaz.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sojixidej.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/biduloxozejutiwi.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/riwuga.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/686295688.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xasoxoxadubo.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/wemijeziburuweleruvaju.pdfIn PDF document text
    • http://marketingnews.fr/images/file/kobipegesofil.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197933409908.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/70794726944.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4c79cbdd---86485826861.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xesilubozapudawalakibu.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/77121314269.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/2734954256.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/38251412913.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/toded.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6a223de3447c6591c2f90acaff495b1/nuzoziw.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/vapalomigitexasenegis.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/68241757551.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/17376155853.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/57785542391.pdfIn PDF document text
    • http://boldogelet.hu/media/74748416415.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/gozesigebogusekaziz.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/wadam.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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 18672 bytes
SHA-256: 20150b006278f9464fe00828330b422a593bf9770f7f3d55bb249c0b25719ada
font_01_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 10444 bytes
SHA-256: 1f2303c88c7ccc23783bfde86afe4e9291412676393afc37400fb4c40cd5bb4a