Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3bc1853ffbbfbd…

MALICIOUS

PDF

67.8 KB Created: 2021-09-09 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 602d65c7f65eafa7ddb14eec020648bb SHA-1: 2361464af12614189a7e8ac5f6204015ba40f3d4 SHA-256: 0c3bc1853ffbbfbda8a5391eaeba2be8d8ec2299568d22dfa7d715da8a623fdd
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 are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The presence of a 'utm_term' parameter in one URL suggests a lure for downloading specific content, such as 'CS GO offline android'. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mwflower.com/upimagesfile///duwitowoniroredowomis.pdf In PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dumatorozojabage.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261b17b2a3---pugetuputuxeborovarida.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fafuf.pdfIn PDF document text
    • https://ebooksweb.net/files/file/71967179171.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/92390450231.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/55529616187.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/51228704243.pdfIn PDF document text
    • http://emeat.ru/var/files/58242814428.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/vumalogupalafetuwama.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/84757396826.pdfIn PDF document text
    • http://belniig.by/public/file/zaxedotejaborupetowej.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210906/file/88041290634.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/80624676490.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/10530660498.pdfIn PDF document text
    • http://alptw.com/images/files/piritimamojuxudulefi.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/pabunuvubixetakom.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/gajelapige.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/nugaxegomoxorezotuwowox.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/49042987412.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/39923189434.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/33233968814.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/88505709016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+cs+go+offline+androidPDF 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_off0000ae32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE32 10640 bytes
SHA-256: c158eddfdf63b9515a65c29cb808a3e1e100a14c1e0f2763317fec7d123c89c0
font_01_sfnt_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 14164 bytes
SHA-256: 56c68e7a0d8573cca36ba6c8830bd1ccee35028da4a6c38e8d17eb626e45288d