Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca67af0f167be5f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 21:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ceaecf64df658e19fa39a2204e10421f SHA-1: 53d51ffc679be5787cab5743a57e37e7a6d9009a SHA-256: 6ca67af0f167be5f9e76debf02c942e5b483095e5169501e5171e35332c864f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document exhibits characteristics of a phishing and potential malware distribution lure, as indicated by the 'SE_BROWSER_INSTALL_LURE' and 'SE_CALLBACK_LURE' heuristics. The presence of numerous external URIs, including one pointing to 'garglob.ru', suggests an attempt to redirect the user to malicious content or download further payloads. ClamAV detection further solidifies its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=cookie+editor+for+chrome+android PDF link annotation
    • http://www.julietlandau.com/fckeditor/userfiles/file/44168400579.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/36576796006.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/xibijav.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/jolufiwazavaxerepagogup.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/27290983252.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/76609015453.pdfIn PDF document text
    • http://esipro.be/userfiles/file/84317437028.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fujirusedesakegegolej.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/falozujijanawixunubi.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/26295146276.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/2771673712.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/wuwofan.pdfIn PDF document text
    • https://rm-parketi.si/uploads/latelejanipenezodoxosox.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/77121941675.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/57845512732.pdfIn PDF document text
    • http://epicridesnepal.com/files/wonelozerurerelafosariban.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/15391115403.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/fufazofuzokidikirejig.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/wanugumomapexokifopibev.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/46063106631.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345d62794c9---rifuzabijafazidemavadino.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161349c8e95682---vibisemeleretekasekuroros.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lasatofutalufeduwug.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/22754066758.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/rorebinezepifogebifu.pdfIn PDF document text
    • http://hybsch.it/upload/file/nosepa.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_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 16660 bytes
SHA-256: 123dc3374e9112d86e471ce631145596c10af6738e505e170a0e95d18068367c
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10652 bytes
SHA-256: dd641b8b132d08ec0bd5989ebd17bb9ba63481a164a5de329e6ae25c3446d7c9
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1