Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef01ddaeb282c6ca…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 04:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddb7bc1a4e483e2cfc022de58ca619c6 SHA-1: 4f7942d1f1e094b98b1a6a796a6435a8897996e3 SHA-256: ef01ddaeb282c6ca00da6bf8086e1ce74bbe302f18579345c1d5c41b4ba41241
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://oniceh.ru/uplcv?utm_term=is+sulphur+metal+or+nonmetal PDF link annotation
    • https://tedesco.pl/userfiles/file/9923052310.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/37446340206.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/69516005090.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/senamalevedofugakitumapop.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/32639225824.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dagapibiwezakupo.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/sojubixila.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/93958101553.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/51468671351.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/71737571023.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/bumukobojolabililonodu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/romesesilabajiruk.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/sebegumogulin.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/41430864362.pdfIn PDF document text
    • http://chinalabware.net/d/files/69008731818.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/55656662237.pdfIn PDF document text
    • http://mfcpavpos.ru/file/kekufifijeraxixo.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/55124173233.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/2370758297.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/630aa40b58a7eb855c8a3fcaba75b35a/gaxowasowedano.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/pukitexekuwubatov.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lasova.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10476 bytes
SHA-256: 0f108c42527deb1bad0e4b8ca715bdc35581f1ae7c2f628d06816bfc9d894ea8
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17332 bytes
SHA-256: 51858a243b0aca3c171caa41c2814078d2d00afb6e8aed662d53e132dc4b36a5

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