Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4978a1e51b3572f…

MALICIOUS

PDF

61.1 KB Created: 2021-09-12 17:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7aa8f76c454232e99e8525748ccb2946 SHA-1: 49c100aa73509da32600e03aba91fd5e24823a64 SHA-256: f4978a1e51b3572fbd762390cb2b76c179a73136cdd1db9961f611bfcb57cee3
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on distinct domains, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple disposable hosts and UTM parameters in some URLs further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5233

Heuristics 4

  • 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
  • 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://mtt-association.fr/upload/file/juguvajufizunodaloj.pdf In PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81328440322.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/ranotirozivugowizovek.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/pepowa.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/50483149441.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/98895591902.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/96827476948.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f7bc8b---13470765318.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/29333413072.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/13430985617.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/47391407097.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/rijewajavebajuzunig.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/81194066275.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/dowupemanasi.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dufeluxemadigogefenunaw.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tagalutixufigudoju.pdfIn PDF document text
    • http://renknh.com/ckupload/files/dunutozevavupajez.pdfIn PDF document text
    • http://aa-nusd.jp/tolaw.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/wuwavizebobi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a0da0d12---24472950150.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/mazunarazibijijutim.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/69941835785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=unearthed+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10452 bytes
SHA-256: ef184e1b2c5b99e30cd0cf8f0131a07eefcc43a764243a512961111ebeb3e7b2

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