Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21bc1eca037c888…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 16:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2220c938625875016f7b94ec193089a6 SHA-1: c1715f43eb33767a358ed560fc095e281435cfca SHA-256: c21bc1eca037c888b60a1d8d66fc1eae55387fe13c4b535ea35049e76de121d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=dls+2020+original+apk PDF link annotation
    • http://dooroc.com/tk/upload/file/bebiwinumakuvamukojirux.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/lufuvasu.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/kudemadapotoxaj.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/43921103366.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/20940265564.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/kumaliv.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jelitizedalakipolovomon.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/99512175778.pdfIn PDF document text
    • http://odumakus.com/uploads/files/70131245075.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/83294067348.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/35040122929.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/17369701851.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ce8p00bo3p0a465dv9v4q8ul17/buwavitazosotu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136829f8f735---pubetinizapukiwife.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/93066027463.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/6786519474.pdfIn PDF document text
    • http://kotolantopeni.cz/file/poxakivibumovofa.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rolulediwivubagenawe.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/sanubamewuzezot.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kenunuxatapidezozizuwuguj.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/lowomovajez.pdfIn PDF document text
    • https://ijp2.com/contents/files/zixovogedezalenik.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/kawalixukumufuxamurapus.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/lofejunebebuwuguvugide.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 20828 bytes
SHA-256: cabca4beb7f311291610fbd2e1878ec7b139ee6814cb391b9b4f7819c1ea87ad
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 10532 bytes
SHA-256: b4c74fce11dee6f7b8131974ef99c95e4e40416d92f8787fbb4d6e98e126e3b1
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1