Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97dc9a5225ef2e0…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 09:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 030253e6b2d45f64b0cd8809e91c2f6d SHA-1: f49fc9b8759d008af3312af4b01804683c5b3615 SHA-256: d97dc9a5225ef2e05fcea645f982ab7f2966819979d01802726ccee8000f8481
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, indicating an attempt to redirect the user to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm hosted on disposable domains, commonly used for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crysiq.ru/uplcv?utm_term=in+the+time+of+the+butterflies+book+pdf
    • http://symbolfoods.com/files/file///20128241010.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o5fv20rbqcmo0bf3ujic2tudgv/detojan.pdf
    • http://studioriboldi.eu/userfiles/files/salamijolexifat.pdf
    • https://luathoanghuy.com/uploads/files/widoxowisaxe.pdf
    • http://verduciautodemolizioni.it/userfiles/file/lovunowositijuru.pdf
    • http://www.travelwithtaangoo.com/img/file/jekowexu.pdf
    • http://mrybalko.ru/files/lusipikeg.pdf
    • http://lubrifianti-auto.ro/files/file/dumutenunemipiwavubeb.pdf
    • https://livnica-metalurg.com/images/pages/file/terunudo.pdf
    • https://cliniquemyo.com/userfiles/file/timapovadorurefaxedugew.pdf
    • https://zniczekowalczyk.com/user_images/file/tunez.pdf
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/95833799377.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/77770127017.pdf
    • https://promtour-rural.ro/userfiles/file/kejupitufukanoloromeraw.pdf
    • https://bitree.com/ckfinder/userfiles/files/zejururemasusisikitako.pdf
    • http://dopuskvsro.ru/UserFiles/mawoso.pdf
    • http://jjburgerut.com/uploads/files/69360503167.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fj5o89qbr54617b8bsriea1sr1/96552965967.pdf
    • http://innotack.com/userfiles/files/45404076951.pdf
    • http://96rangjai.com/userfiles/file/vebekiliwofopisewidizew.pdf
    • https://inprovituruguay.com/ckfinder/userfiles/files/wofuvutaludifigon.pdf
    • https://t2sc.me/userfiles/8865440864.pdf
    • http://progfin.pl/userfiles/file/zazovaririx.pdf
    • 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_off0000ad6f.bin
ad112bf4cba14e4066ba2bb0d25f8405272eefe5f2dddf0154c7f6f0b9f94370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6F 10884 bytes
font_01_sfnt_off0000c61a.bin
03a696c316ab7e744312b074a42b5e002f870b757a575012286e88dba7303338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 14448 bytes
font_02_sfnt_off0000ea0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes

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