Malicious PDF — malware analysis report

Static analysis result for SHA-256 a650f048fbe37697…

MALICIOUS

PDF

67.6 KB Created: 2021-09-16 20:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b54350f1d4ced8b6e7871e33358d4fc5 SHA-1: 4dfda29fa94bad638be9ec4bb8c7a86f45670b78 SHA-256: a650f048fbe3769739f815d9bd21153f73a415ee98cf5d4dd56c3ef741bc6b1f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous external links hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://garglob.ru/uplcv?utm_term=fts+14+android+download PDF link annotation
    • http://hotelrealerimini.it/userfiles/files/seruwoje.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/66051035451.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/67321275416.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/73273543038.pdfIn PDF document text
    • http://ustunongel.com/image/files/gotagijapo.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lepariwajamisoniwofileli.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/53983364496.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fifekesuxizew.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/dubenefogatesamofatepugi.pdfIn PDF document text
    • http://garderoba.sk/images/_file/49510508803.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/boxogegokulumidipemux.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kisalijikozipoxijoxo.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/nejuwowo.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/69647165425.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f2c58b5abb79bcdc11d091f3c00ee60d/49293379813.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/25017206621.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zonewalibajijixerewabove.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/sosoxitod.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/nivenalizebenit.pdfIn PDF document text
    • https://ijpdua.com/contents/files/mogutilun.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/44357727230.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/55376063594.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/60573332834.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/wenifanapi.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_off0000ae14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE14 14132 bytes
SHA-256: b1496ec2a62e871b3f985f54c466456ceefb96f00b10b327b7aec346ea532685
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10300 bytes
SHA-256: 897f04236f8d42aa2f369f4a740bc70ca65df814c2709c12f344119ed82a5c43