Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f6d1388757f3df…

MALICIOUS

PDF

90.9 KB Created: 2021-09-13 06:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d859721ea0cce140930a04214cc1d03 SHA-1: 891d880c6a566937145670ea9d0cbad900e5df61 SHA-256: 46f6d1388757f3df5b4431ebb3e4d39a00d574bbb052e1872fb7830568d11e33
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hv2barrier.com/application/third_party/ckfinder/userfiles/files/kalezazarokelaxulow.pdf
    • http://fine-trading-knotwork.de/uploads/media/zilexines.pdf
    • https://deltarents.com/upload/ckfinder/files/zemejumuwufagi.pdf
    • http://standardamulet.com/files/files/watibekito.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///567409104.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/55c77986ef01cf970a8db17f78c13622/25949890046.pdf
    • http://skupka54.ru/upload/m/63022562607.pdf
    • http://canshu.dlzj.net/upload/files/20210904143407374960.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/foroduvexipupoko.pdf
    • http://www.dilipprabhavalkar.com/images/file/42381555719.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/633lq7vkjskff1ltuu65usm6dk/joruvomokigazowof.pdf
    • http://gelinyuanyi.com/upload_fck/file/2021-9-7/20210907060104677753.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/doxuturamevota.pdf
    • https://imotrading.com/images/userfiles/mojewi.pdf
    • http://german-ex.com/images/blog/file/92878866632.pdf
    • http://bowie.abwingsmd.com/uploads/files/99136022053.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/jomovavow.pdf
    • https://clubberia.com/js/ckfinder/userfiles/files/wadafugixod.pdf
    • http://barcelonasixtytwo.com/userfiles/file/4761575707.pdf
    • http://christopherspubandgrille.com/userfiles/files/tenewafusum.pdf
    • http://mcdanielz.eu/files/file/70527329237.pdf
    • https://cartolmania.it/file/31174531182.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60767909580.pdf
    • http://lovesushiscv.com/uploads/files/pegazunaxogokated.pdf
    • https://gotoko.com/cmsv2/upload/files/powosivilodijigisi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=someone+like+you+movie
    • 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_off00010281.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 16792 bytes
font_01_sfnt_off00011a98.bin
a5321b8d798708a07f0b3932e940c48f20030485d54fe93187993ac097f4d25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 10188 bytes
font_02_sfnt_off0001315d.bin
a1bcd88fee3fd8f09e5d0495787d8d7f6f3f55ca64442565243b671df0510aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 17376 bytes

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