Malicious PDF — malware analysis report

Static analysis result for SHA-256 9639b2e8a97a70ba…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 15:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e94804e31f180a17fc5c09f4d629ecd7 SHA-1: 9b210a5fa54d547ee2947d6ea29a809ec57b5b61 SHA-256: 9639b2e8a97a70badd79943239f0a327d3eef8c30c1c76e8963c72213192b1ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion identified as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://iberia-ex.com/images/blog/file/fotixolororizezu.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c83886c---melilabezezizanalut.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/37620571534.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/57404718631.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2903820500.pdfIn PDF document text
    • https://forumsevens.com/images/file/saxatozaxep.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/3618892899.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/40899767830.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210913_192604.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/40809684031.pdfIn PDF document text
    • https://unaizahic.com/Files/files/4432071373.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/bamosafovi.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/83836785402.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/nuvawexuju.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/19717076093.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131615134183.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a232a9f11d---20041660528.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/73690059367.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76748114088.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vikazuzitoxo.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/97769374077.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/rusur.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/62264302381.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/38380379437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+2d+game+androidPDF link annotation
    • 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_off0000b465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 10716 bytes
SHA-256: 27641ad92956005bca38e46ba2d6259cb17a3d52fc10286579fdd5df1da2d92c
font_01_sfnt_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 16584 bytes
SHA-256: e4d92291c32ce1172ccb4ac71e065a8f94dc239029a2fa409139ce22cea58894