Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f719a1d48edd1d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 06:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 107694c481beca6d7075259cdef64049 SHA-1: c7fff4f52c051a5978beabd49f2f3531341a87ec SHA-256: f9f719a1d48edd1d114b0105afc441c35e3206712d35f420ff106cc06462921a
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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 http://quimis.net/js/ckfinder/userfiles/files/vubox.pdf In PDF document text
    • http://www.jasolasia.com/image/upload/File/jufugomevaferotef.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/75647217290.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/takawanegagubowa.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/ronazetimibowu.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/mexile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4aab2676---bugemudebatajibuxok.pdfIn PDF document text
    • https://polandpools.com/contents/files/kipawadon.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/16680088989.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/revujuwupufetazavujadew.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tagogiwosilibip.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/58720745040.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/vamelazenepilega.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/85900091519.pdfIn PDF document text
    • https://brakos.it/file/86653944590.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/67774595512.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pomatoviwibagot.pdfIn PDF document text
    • http://coachhouse.info/assets/file/zanujudemuwabenobetutebud.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/fukobe.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wizazedesi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/8602103572.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906190524.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7e204063---bigiwasamu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/joduwagodigujizexo.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pojilokeworirutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+inspect+in+google+chrome+androidPDF 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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 11036 bytes
SHA-256: cf01b77afa534500b7a6aa1a1cbf9cd8750639cfa52278c7839769c6b7271445
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 17300 bytes
SHA-256: 8e60e064b3606f06b892627377e9f276dfe98c94dd71f090dec6bb29a763c01a
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1