Malicious PDF — malware analysis report

Static analysis result for SHA-256 971ee808f7d6c434…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 08:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fa2c7936fcf6b512f4273d5ac057018 SHA-1: 3f5bf7786844308b11a4edfb06b680949024816f SHA-256: 971ee808f7d6c4349b8c3f0966e33cccca6511eba2db7b438d7d3efc72d8cbac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://amindoost.ir/images/upload/files/vikamu.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6119feefedb395d6d733c420fb1d843c/6270657430.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/19104882194.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/zirojikivufulifazebapare.pdfIn PDF document text
    • http://liluby.com/upload/file/15441369007.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pobapen.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/32549427327.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/62118999407.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/kezigimefodedixabasozok.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/duwejogurisasepujabu.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/38536714401.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/140862207.pdfIn PDF document text
    • https://ismart99.net/upload/files/98041740671.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/11840690530.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/damaxaduvujikoximit.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ca5fec7---71719133673.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/voramopeg.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/30613501367.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71679846574.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/29566246831.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/24946803897.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/wofatovedetoraxevu.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/tozewek.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/95547263258.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/17023194547.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/lolikidatajido.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/63496996877.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/74686716721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pathirayo+pakalai+song+mp3+free+downloadPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 11412 bytes
SHA-256: bfd37e54fbae2e8a349b08e80c70a915e2aebc188314f9317a76d1d1d23bc08e
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 18764 bytes
SHA-256: c26e395e21721e5b688c8f06f83122b024c83c0a767f3d9a4a1a92fe7265f00d
font_02_sfnt_off00011691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1