Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3dfd6721b9a0f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-10 19:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a74e34912f44b69d652abb5f1e7a767 SHA-1: 1e1b06207a6b80b88186c82045fc6cce3b347dee SHA-256: 21f3dfd6721b9a0f6880d4d166139824ccf2acc70acec4dd0112cb060493bc6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to obscure the final malicious destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.mab-solutions.fr/upload/file/77106150212.pdf In PDF document text
    • http://polenes.cl/userfiles/file/wizumodip.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/xoxirabutere.pdfIn PDF document text
    • http://ellev.fr/upload/files/nopudaxabapesepedava.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/kugokikavebefeguseza.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/dijapinixaselipawekaw.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/71770666472.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/86419455868.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/duzufanusa.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec100222be---75255515084.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/93340854434.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/solotosesipumow.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/gepukit.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/zabomerijiseme.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/96b40eca553a724338af07f6bef8e890/4104774556.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/wojorulaxudo.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/ginimogemuxotaxixixutesot.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/wuzejiw.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/finakegami.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/71625015146.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/1258819368.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/soxowatizusakodemojure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+power+of+positive+thinking+pdf+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_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 18636 bytes
SHA-256: c682b1f35292cdd347553a0bc95652a9c95efed9c014f7160e52dae7e554de76
font_02_sfnt_off00013ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC1 10984 bytes
SHA-256: 108c97946b7e101e128951afaa43cee0e5264c489215a8a7c4cc5e9b9ccbabd1

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