Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b6536d9636e18e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-29 08:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ca4cf968a90df742e00162b72cc8bcc SHA-1: 6e57228244b39e8a1ed6a46e607c20738dac94cb SHA-256: 77b6536d9636e18e00e13584f9147ab369dee5f0d861b154c577605328960693
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to redirect the user to one of the numerous external URLs found in the document, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://tourgardan.com/basefile/tourgardancom/files/80025230088.pdf In PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/30643036694.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/180038254.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/28668678212.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/58835987075.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/65832188600.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/94357072959.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/43354005299.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/25184326415.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/penatubenukadomorofa.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/54059097323.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/55244325105.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/gejoxatatavufobetex.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/36327027920.pdfIn PDF document text
    • http://greenld.com/userfiles/44353640248.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80274330094.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/rebudemaxisosinetisono.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149097814729---dalikiromofo.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/pudawavekuretogasi.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/90498913584.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/subasawonopilafag.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/loripufugikimabasupori.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/51191441297.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gofutebuxenipujazebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=yeh+raaste+hain+pyaar+ke+old+moviePDF 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_off0000bdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF9 18056 bytes
SHA-256: 390cf49435138ca64f11e5c25864049621d7f4c7d7b82e587f2cb791c3faae25
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 10912 bytes
SHA-256: 193c9fbb3626aceb9754883d9dc28cdd598c12bfdd542e702fca41850268a128