Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd954851207d09f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 22:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e71c1913d1b5fbea40fe2af9f01af8b3 SHA-1: ad357e836c9b806bc301e23417a59a2c644fd423 SHA-256: cbd954851207d09f19b126ae7eed05e3f9e56100e136819b87b3ecfcd806f8d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161395f7fbbfe1---23265856278.pdf In PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/remulomolaxumowaneb.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/96324668290.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/40824787970.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/7236170932.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/18747960416.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/80246920764.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/xugelalosagomurunomesim.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/35133800868.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/dalerazuwi.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/xifotejofenowosubiluz.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/bevalowubagivaxujuma.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/9089923648.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vakagotimelenulixagupuw.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/nijovusofijinela.pdfIn PDF document text
    • http://zl369.net/userfiles/file/58091360563.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/puvum.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/kenes.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/detadepudaxezunejevax.pdfIn PDF document text
    • https://marosme.ro/hirek/file/83891457987.pdfIn PDF document text
    • http://klinok-saintp.ru/files/15005361782.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bolasexalotarabirogiko.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vudowofaligojepomi.pdfIn PDF document text
    • https://kokomanis.com/contents/files/91941834418.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a9de8d2d44b2eb651c6c43dc75562d7e/68794167745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+game+ppsspp+3rd+birthdayPDF 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 17336 bytes
SHA-256: 01b2250f2992b6839d5131b85720971c863a699bf87e9ae4f38c7fb38f544f4b
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 11352 bytes
SHA-256: fa4cb6f0dc18db0801811d478e2d76538546ac817c1e6b1d1299c0ed5962bb9e