Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edf39551da5653e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 18:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8bccc0d5da815bc201b276d911c22df SHA-1: 9f9ffea7b87dcf7d8533465d3a093843f0d6c97c SHA-256: 5edf39551da5653e4581937ced0f9de35d01ad8b4c83eda41323ca261b69d23b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://mkserwis.pl/userfiles/file/nosuveponexupotifazuxudas.pdf
    • http://fkm-lux.by/var/upload/file/36817794944.pdf
    • http://style4.allwebeasy.com/userfiles/files/30683542430.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hgenj5fvb3tja7i2bq8qp4jip6/rituw.pdf
    • http://www.abcklima.hu/data/editorfile/84162127855.pdf
    • https://aucordechasse.fr/vosImages/65174033495.pdf
    • http://roocenter.ru/upload/file/mewid.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/ladutaze.pdf
    • https://gemicilojistik.com/userfiles/upload/file/38602449606.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/82863608220.pdf
    • http://laptopcuhaiphong.vn/upload/files/19270247169.pdf
    • http://debrecen.varosom.hu/userfiles/files/4671195509.pdf
    • https://ambalatender.com/upload/files/tigejuzojebilog.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392eecb4956---43972043162.pdf
    • https://iuoshili.com/upload/users/files/3180656603.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/raxogazomiwibo.pdf
    • http://cbcom.fr/ressource/site-image/files/12522593444.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/pilagetoju.pdf
    • http://ocean-ex.com/images/blog/file/kizaruz.pdf
    • http://dayou.tw/uploadpic/files/202109040046418918.pdf
    • http://zvaracskaskola.eu/editor_uploads/system/files/bitowuroxevorokovokixug.pdf
    • http://dotykbylinky.sk/_subory/subory/7419384589.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/61691054274.pdf
    • http://beiks.info/public/file/53843618816.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/ruvenuburadedo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cooking+fever+hacked+version+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b175.bin
40c7d46b094bf8e468ed84399b7f539b987d8086ad07570c516aaa2d6f2395cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 14568 bytes
font_01_sfnt_off0000d5c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 16792 bytes
font_02_sfnt_off0000eddb.bin
9308a958d99b04acbf38ca800ffa868c347d29d10d25c37187e3039e79b6d90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10932 bytes

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