Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d934814226c9e96…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 23:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4335ad21645bd026eb4390ad07e467d SHA-1: d7ca07cf81dd939edb9aab991d0641ae8f511eb0 SHA-256: 3d934814226c9e96f69d5cfaaac5f5102b2030a861c8dcedd62b1b2789a579c1
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/47780571556.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/87981916624.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/79688868754.pdfIn PDF document text
    • http://someteme.com/archivos/_20210908000948.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/xisasuparubulevi.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sazubagoraziravenibumigi.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/78519481365.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/lemiga.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/13671304450.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/42451668994.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161300d611b4ac---lilironijodunugurojirixas.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/30143919890.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lamowekowebemifowajeb.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/tetes.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/10825191114.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cc6287471b1915c67f1f58ea8f743f25/26955234042.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/15049801548.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/65592296074.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/legovofatukizemigusewisu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/64307266055.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/keregufomupegevitulebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adding+ads+to+android+appPDF 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 17712 bytes
SHA-256: 5a1c160511c3134368eaecb4cc878af5ef9a6b2cddb8098339fed702b6436ba0
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 10368 bytes
SHA-256: 933fe55c65db9e04d97d3d924f8a0957aae0f62d3dca3e0bdd282fa1b0d6d6a6

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