Malicious PDF — malware analysis report

Static analysis result for SHA-256 f039922e8fbf6b18…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 17:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8745d02f11c9e66039c2df1eac18fe2d SHA-1: c42caab3029384ecd0ee4950cc0d35358da0e733 SHA-256: f039922e8fbf6b182c2304b71c7dc56ffd357605fa44b8a8a2d74968fb9e880b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into downloading a password-protected payload, likely to evade gateway scanning. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=gta+san+andreas+apk+data+lite
    • http://tmacfashion.com/ckfinder/userfiles/files/tiwagezutudevide.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdf
    • http://noithatphathuy.com/Images_upload/files/jidesilorizufewuxibo.pdf
    • http://jsdarvin.com/files/11719359467.pdf
    • http://way-of-spirit.ru/upload/file/8562157318.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/nitozorapuxisaruwuwudaso.pdf
    • http://abwjefferson.com/uploads/files/rizilifiraloverogakaduj.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/75409309520.pdf
    • https://demircanticaret.com/userfiles/file/67893012113.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4944f4df9b9a4b7cc8188acf244d4b5e/texovogalibomexo.pdf
    • http://tincorner.vn/uploads/files/21363311230.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/72690421323.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210902085331896715hfv1ht.pdf
    • http://driver-jazda.pl/upload/file/disoka.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/74468749554.pdf
    • http://cuacuongiare.vn/upload/files/92223958199.pdf
    • http://majortaylorride.info/images/uploaded/file/89642975892.pdf
    • http://hidropro.hu/upload/4660723771.pdf
    • http://ximangsongthao.com/app/webroot/uploads/files/ximerug.pdf
    • http://interel-rus.ru/test/sites/default/files/file/60071317077.pdf
    • https://rsebolivia.org/userfiles/file/35488698783.pdf
    • https://webtechnocrats.com/upload/file/gedepotaboxexaxokug.pdf
    • http://matrix-corporation.com/upfiles/editor/files/63473277308.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/77756945290.pdf
    • http://studiotravenzolo.it/userfiles/files/93065063931.pdf
    • https://nutrishop.in/ci/userfiles/files/setulukevemanaguku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c110.bin
26ca976390963e6da6b2a369f2776bf8c76c4d1599586cbdc87de8bca81c5e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC110 10396 bytes
font_01_sfnt_off0000d8a8.bin
3e8609195a942b7c6896dad1503d44f876c6b92aebcc272743661a4d98565e21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16832 bytes
font_02_sfnt_off000104a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes