Malicious PDF — malware analysis report

Static analysis result for SHA-256 160a1117d1b39592…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 11:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37ae32724a42dd7d80c5ed6b5eaffe94 SHA-1: 15c2bcd0ed7dce87a602e8739afaaacdd797836e SHA-256: 160a1117d1b395920a0c1d9ccee9fdfd540c9dab365c233ec6cb9e01fa60795a
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and external URIs, flagged by heuristics as malicious. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install remote support tools, a common tactic for phishing or malware delivery. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://playerpress.com/ckfinder/userfiles/files/vizur.pdf In PDF document text
    • https://geneticapanama.com/userfiles/file/58939140919.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/niselavajanivarexo.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/miluv.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e5fe8dea54f3d471dc7ec634d70806dc/18541000012.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/jipej.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/gejefosa.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/losasuniguvajomup.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/nesetarateram.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/40911996738.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/robefefugupezutapuzup.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/32276396200.pdfIn PDF document text
    • http://centronegozi.com/public/jexolemilorukefafirebel.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/95031865008.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levolum.pdfIn PDF document text
    • http://santeh.md/img/files/93308353790.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/2526748089.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/tapebulonuz.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/juwaribaxunezegelolebixim.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/53053493820.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437bdd52bc5---kefitifumura.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/50516314761.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/68572805152.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/24194498817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+ms+office+2013+for+android+mobilePDF 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_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 17468 bytes
SHA-256: eeb873d6a8008553380e1026359e644f0dd470747c880359ce81632100302beb
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 11232 bytes
SHA-256: 1e151c76a581120728d6f416a1f0ebe9cb47e60201acf7ec3ce4dd2e4261e257