Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68bca041de3edca…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 05:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9691d9eb0723a3eccec4382cd5fb5c7 SHA-1: 8f388fbfabe09ef8a23b0b68b4642f9573380d27 SHA-256: c68bca041de3edcaeb74869d544814ba99517e0abfde46ddbee357ec11c386e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many of which are associated with link farms and disposable hosting, suggests an attempt to obscure the ultimate destination of a phishing or malware delivery chain. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://sevvalturizm.com/rsm/files/84777289804.pdf In PDF document text
    • https://jagamimpi.info/contents/files/nefevexagimeseb.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/83435399117.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/manilupitoturufejemukag.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/jepim.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/13865665076.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8982461c540d9678c4b75f7eef4aad2a/gejenumumuw.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/37775743847.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/31416881066.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/rekofifusalutasufonot.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/38186421169.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/sados.pdfIn PDF document text
    • http://chicopharm.com/upload/files/xibufamibimokeziv.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/44538544729.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/6453521700.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/pagaxazufesokizagamobozi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a686f256c---tapavubovomugugunujage.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zapifexowed.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/41648002218.pdfIn PDF document text
    • https://o-dance.com/upload/files/dopukeg.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/xelogoderivuparofobax.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/69543074166.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091320282970.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/87934189378.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/73211452392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=longman+preparation+course+for+the+toefl+test+3rd+edition+pdfPDF 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_off0000be0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 18488 bytes
SHA-256: 5ff9a9ce91b330523a1915aa4b60ca57ce17f5451d60936e171b9f72aa0f0d5f
font_02_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 11296 bytes
SHA-256: 219873aa9d31302cd9312db7ac74077e2458d3c21aa0e2453f47b6d55ba6fbc4