Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9972d377266a9f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 04:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c4e0363ade9d881eacac3cbb7eadefa6 SHA-1: 9c2a2a275ac0125fc6bc07d8ac2289855dd69554 SHA-256: 6d9972d377266a9fe998fa10d3bd153e76ce349cc03cbcf3d9d0fec7a2118802
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spamming operation. The presence of external URIs points towards an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=basketball+stars+unblocked+games PDF link annotation
    • https://thisissati.com/userfiles/files/fisezikibekub.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/66516508137.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/67727540837.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bevagorexenedelibowu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/7305901875.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/98010269496.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630835802.pdfIn PDF document text
    • https://dellrein.ru/content/file/77880233556.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/midubaxowezabatemuvixero.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/vulirumagumumurisabo.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zavawadaxuwegakasobukeful.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/86370557697.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630599382.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/lilolejufuf.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/90984628838.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/2231229033.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/wegowiravewen.pdfIn PDF document text
    • https://highrise.pl/file/furugovejumupukaforubifag.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140670d3a6c0---62907119739.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/zijomatamirikuvik.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/30372582844.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/52333197309.pdfIn PDF document text
    • http://giga.sk/storage/file/gapaz.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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 11008 bytes
SHA-256: bb4abdb6f6074c91f7de3af3c8ab51e7be823146121f9c321cf35e5cb303ae96
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 17460 bytes
SHA-256: 06160f6a3c1be28805e96d11a290eb22d635f6f94e7402ff742f74b7d83dcd6e