Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92e4c50aede8dd1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 21:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37b6c0d4941ce3435913c0ad02976f31 SHA-1: 26a8fa5a45aa73675361cf84171ee2fdaf13d30d SHA-256: b92e4c50aede8dd1056390988da353244219800dea50fadbb1898d7f2dc191d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://infrive.ru/uplcv?utm_term=tekken+7+dark+resurrection+for+android+iso PDF link annotation
    • http://nemalipics.com/duxunize.pdfIn PDF document text
    • https://togeltop.net/contents/files/nerirez.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/junurowevujisen.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/53980745526.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/18051393558.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/8614795323.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210911204338.pdfIn PDF document text
    • http://mfcpavpos.ru/file/damobasutenus.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/29451133986.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/57072389712.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/26996630640.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/57385145504.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/3634345393.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/numuwejow.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/90607888805.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/defuzimoropakemowaz.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/2200577957.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/jefokexobe.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/19840126590.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902050353_1658564135.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s8jauj4031rtn6cdmk637disru/pexidevivikakubesawulon.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gomimefoselamatejem.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/jezafobabakud.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/22416183149.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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10628 bytes
SHA-256: 7fa4ff5cccf50b65545a90dfd684891393b514ad718c8e3aa8409981b15b1a03
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 17480 bytes
SHA-256: 6a117cedfb1cc40d6694774f33043fdf2ea5bbc7b91c66336471c5f9025aa50b