Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4edf45989642e7f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 08:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4b14a67a344267db7b20d636acd94a0 SHA-1: 9d36fd68ab23d902d1a8527f45e3a10616253a73 SHA-256: f4edf45989642e7f8752f8bf50d4e52352ce8ee59fe1a86e08b28c2bec90d4de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm on disposable domains, with numerous unique hosts and links, suggesting a phishing or scam attempt. The embedded URLs point to various PDF files hosted on these suspicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mdknoodles.co/uploads/files/71113771250.pdf In PDF document text
    • http://biosystech.com/pdsFck/file/midepejuga.pdfIn PDF document text
    • http://strandedtattoo.info/file/60094859730.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/purav.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133a88f8a8fe---nekumupo.pdfIn PDF document text
    • http://domexpo.ru/up/file/wafikisabogas.pdfIn PDF document text
    • http://zenkatsu.dk/files/78951007338.pdfIn PDF document text
    • http://dsagco.com/Upload/file/vumuzoxivofitegat.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/86703884305.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161326a81b7f0a---xesuguzoxajujavugis.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dotisaredojo.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/46836472852.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/46300489853.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/39954143909.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/45865304407.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/bitiri.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/filavixutanivim.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/bimudufuwusoparoxu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/padotalopulixodufip.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/79566810061.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16132dea3e41bb---wasuvonoge.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/jafawiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=black+friday+2020+unlocked+iphone+dealsPDF 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_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 11220 bytes
SHA-256: b5fb3d84175091978bfd4dc0ac23038eb283806c61167b49287745c0e95903cf
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 18664 bytes
SHA-256: 4a2c4b919cf626c48e6d1d1eff02b0fde5efc51601a02f5346e2faf6e52e6235
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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