Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48613d18fad9124…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 09:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65e049693af5ac593de4f31c1943397b SHA-1: 2124efc1c4d649b0cfd87aa266ea073d0157594e SHA-256: b48613d18fad91248b0de5911bc71bea4c634d50566052d49aa9c53b96df472c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the extensive use of external links points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=saw+pelicula+en+espa%C3%B1ol PDF link annotation
    • http://huh.hu/UserFiles/File/91645056472.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7210839249bdac61223b0063ecc8421/31350522448.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/36755827117.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914080355223908.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/widarudixuwipo.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/24697466033.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/77172200808.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/jipafu.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/30854648380.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912145412803164.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210917_44C25BD2998829FE.pdfIn PDF document text
    • https://hiroyoung.com/data/files/ratetol.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/37314863414.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/namut.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefumesejoxozagipokag.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/70943663103.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-17-10-17-77.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/39133976929.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/jogamu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fisotirekog.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/52632659862.pdfIn PDF document text
    • http://kodemari.info/data/files/4950012881.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210915151720.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_off0000ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 10636 bytes
SHA-256: 3e79830c008df67d470a9ccde5786af59b9c2477035916c0595b5faf94ef4e4b
font_01_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 18048 bytes
SHA-256: c289cf208ea5263b2db8b81a343700bf93fe85badae130b96377bf9e211d2491
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1