Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f533d3de47ef02…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 21:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e28c76cca1fd3cfaf12f5c3a57aafaaf SHA-1: d0a294aebbc15ebc519c75c0151aedc0c6e9a3a1 SHA-256: c0f533d3de47ef02456864c9f7506c68e4743ba3fd7ef7b2a80976a07f04ae6c
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one with a 'spy call recorder free' UTM term, suggests a phishing or social engineering lure. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into clicking a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=spy+call+recorder+free
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2af716ad---7554274614.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/setetepuwabobesizapu.pdf
    • http://toanlinh.vn/upload/files/70191020214.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc8fbf04f---4289947357.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/kikogapabezidap.pdf
    • http://lev-steklo.ru/userfiles/file/ketodakedoli.pdf
    • https://hinodanang.com/uploads/image/files/39013053924.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/lesofitoxebapufukarelawal.pdf
    • https://rheinfurth.de/userfiles/file/46609305484.pdf
    • https://bcbc3399.com/upload/files/zatigawixodinus.pdf
    • http://batiment-tunisie.com/userfiles/file/6650640178.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kuniwovumewojagefedef.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/3875829859.pdf
    • https://benmoonpharma.com/userfiles/file/94466197407.pdf
    • http://potya.com/10378862256.pdf
    • http://curry-box-deluxe.de/userfiles/file/sofumubavadamatuje.pdf
    • http://zaintik.org/files/galeria/files/texefubaburobokofujuna.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/19582085812.pdf
    • https://nurea.se/currency/userfiles/file/85722557578.pdf
    • http://nilesk.com/userfiles/file/35712644200.pdf
    • https://kiofruits.com/admin/uploads/files/788394388.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399adfe7980---67871277112.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/pudemuvo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16792 bytes
font_01_sfnt_off0000f12d.bin
d7543a13bd4d0ae3b939f7ceb7dd4e89b6aef3c5ccf7a2db3bea5beff4adefdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 17876 bytes
font_02_sfnt_off00011e4e.bin
84842ff9bd7ea9b327b8eed983c890c932a9942be604df5c2bdabc12c5e198f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10340 bytes

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