Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7caa7257607716…

MALICIOUS

PDF

85.0 KB Created: 2021-10-06 12:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33004e2ef2b951f834572d936fb4dec6 SHA-1: 4f4664feb46cdeda739e6b5d5c00f41cacadb907 SHA-256: fd7caa7257607716811d4cc7f8ed737877f481cbc0bccfb19ad2c3736f25747e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a phishing or redirection scheme. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/19441ce135ac8d9b5671ce4d846148d4/19283840835.pdf In PDF document text
    • http://keramann.ru/uploads/files/porabijotepedelumede.pdfIn PDF document text
    • https://kokomanis.com/contents/files/punuxovejurimixibuboxuke.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/newobosukunujunav.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/poseruwafifupo.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/33126084570.pdfIn PDF document text
    • https://matratva.in/userfiles/file/97446608198.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/moraji.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/suzuliveme.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/26904795786.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/vasen.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/24439632095.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/sanamidumozogelolapiritim.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/96691849951.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/43108077417.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/maxusamojovam.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/girenibagizu.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jizufene.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/wevomimum.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/36719150832.pdfIn PDF document text
    • http://ellev.fr/upload/files/zerumu.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/dotadebiwabakez.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7c7436e014819496bcaf9fb28fd26f48/xakuzudoligilulabutub.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/11214369995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=used+to+and+be+used+to+exercises+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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 18548 bytes
SHA-256: 4202887dde81b6497c1252243b156ae1ec1b28fdce7180095bfb4bac3447d016
font_01_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10916 bytes
SHA-256: 73e89255521e8467bcf707f9de37a33d24b01bffad7c7c17afe7c927da53b62e
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1