Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91105693c45b24c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 08:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b9bba685dce9f460c4792d54b69933c SHA-1: 39e6319aa2ae4f72ddb00019af38bfb1c73cb1d0 SHA-256: f91105693c45b24cf4664e01123ca9815deb4a0a2db4eba7b025db288da8e46c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also hosts a large number of external URLs, many on disposable domains, suggesting a phishing or credential harvesting campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=launch+center+pro+android PDF link annotation
    • http://atsolution.org/userfiles/file/20210911130259218789672.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/keraludubug.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/sewasisevesikatugipumafev.pdfIn PDF document text
    • http://precisao.net/files/files/zapujusov.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/33197482651.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/potewuwevizevomu.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/jirekamibogudozi.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jatemavolunewu.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vijitapoxufigebe.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/tadot.pdfIn PDF document text
    • https://derfo.info/resimler/files/15109729867.pdfIn PDF document text
    • http://vinmexindia.com/uploads/94391097435.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/xuxuxojepazulaxaj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e38e9fc3c---45116520035.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/ruruni.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44680445293.pdfIn PDF document text
    • https://noventa.cz/media/files/file/47454392122.pdfIn PDF document text
    • http://ergakiland.ru/files/files/66305957714.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/11606382673.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/16743244190.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/89584990187.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/40898941939.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/34256102015.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210923/file/16324146635071.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/fuwosifibekatup.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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 10452 bytes
SHA-256: a66a21d995b98cddcb45ed4bf4adfce86d4c354c09605507ffecab0bde5fb6c3
font_02_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 17456 bytes
SHA-256: 9148e1a970b86b0f9adc918b3d74c07bef63b3c2e460dd835760758f6b15c585