Malicious PDF — malware analysis report

Static analysis result for SHA-256 22251053cb9aafcb…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 18:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7311f1302e20af0eb562953af9f4a2d5 SHA-1: e6b2c597f645e36a61f4bd0ec2745306f5410cfb SHA-256: 22251053cb9aafcba996fa838d7939dce31fa6d213bf52bc7d19f814b8e478e0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing lure technique, presenting itself as an image to entice user interaction. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ecoverservice.be/gallery/file/muzakogupejovademufadin.pdf In PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090708544159.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109081515283108.pdfIn PDF document text
    • http://raczcsalad.hu/files/14463148584.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/36893725639.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/lifusokimatati.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/13325978753.pdfIn PDF document text
    • https://projetovm.com/uploads/files/2682661739.pdfIn PDF document text
    • https://irrisyst.eu/files/file/52774325536.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/suletelebiperalawerowaxa.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/58272557668.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/1056336445.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/41243903935.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/34793431969.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/sokorezebajebuzizejaga.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/robenajodu.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/xazus.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/63802466944.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/giloder.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/zufozosavodevasotiw.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161341002a6368---taxinolupudulukilo.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/nuvedagalekipugive.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/78255219226.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/7954683006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=car+game+hill+climb+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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 14196 bytes
SHA-256: 3df62798808c1e9057ae2ca7fa93c05ef8cbf0159a6d9cb44c70c171c1436f65
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10808 bytes
SHA-256: d77d3a7ce6bb31ed6bbc2b073f45e2d9a8fe0b298877c5ac45b063845c25d27c
font_02_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1