Malicious PDF — malware analysis report

Static analysis result for SHA-256 be71823353addd7d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 20:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c21cf41473e167875928a4ba1f50aedf SHA-1: dc28697b33fb3623b799b5dd69b1649fe1439889 SHA-256: be71823353addd7d32bde0587372e30ef7d1aa6fdf2e60ba0167c95b7185c4f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URIs hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/uplcv?utm_term=physics+1+textbook+pdf PDF link annotation
    • https://suprizpin.com/calisma2/files/uploads/52561959915.pdfIn PDF document text
    • https://termoformat.md/img/files/soranajatogeninasij.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/89760508611.pdfIn PDF document text
    • http://intertribo.sk/files/23342309812.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/kipemosukam.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/97942065835.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/bakegavakin.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/jamotona.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a19a98e1767ac35cdecdf5b65f01e754/58564537559.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/42884459657.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a768e33be---jasawiput.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gevojakawalerajedalibij.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/23006701527.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/bugojarozete.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/83422523835.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/vukarul.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/99781010022.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/pufuminefiwekabuze.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_off0000abf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF5 10808 bytes
SHA-256: 5e04762fd8416d9d7d63621c026d6795372220b405f0d050bd3a6dfa05ba4bd6
font_01_sfnt_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 17912 bytes
SHA-256: 9dd5923976f0d07b484bed7bfa8550cc6473f0551cafa67516fe47832b0a811c
font_02_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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