Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28054ed72166bc2…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 20:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6f89ba50585f9284ac27bc6066cf00b SHA-1: 417c5e8bf17d476990c50f857b465d17e82e616b SHA-256: b28054ed72166bc2c2110926c6b760768103fa40dc71da5dc279a7738e1a56c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including its small size and image-only appearance. The document body is heavily obfuscated, but the presence of JavaScript and numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://sutipatika.hu/userfiles/files/nojupiwoxofik.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/nutilo.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///xovevitumadutisogoduv.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/47153516053.pdf
    • http://prvugkh.ru/uploads/files/lodataziwugufuxozivogov.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79f167e61---28052409996.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/mujosufisudovo.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/50940422044.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/sipibopavibinu.pdf
    • http://hkbroadwin.com/userfiles/86549705495.pdf
    • http://topenglish.sk/app/webroot/gallery/files/19734766222.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/68645078487.pdf
    • http://lorichphoto.com/pictures/file/rixoxirejidoselibidep.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/36926910463.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/63907599122.pdf
    • http://blow-w124.com/js/upload/files/kaguzipofijub.pdf
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/51142575451.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/25105783201.pdf
    • http://mistral-paints.cz/userfiles/files/85402621538.pdf
    • http://dr-temt.ru/images/file/nesoxutamerobuju.pdf
    • http://evo-models.com/uploads/userfiles/files/37861298364.pdf
    • https://askisan.com/upload/ckfinder/files/fobutowamude.pdf
    • https://ferropula.hr/files/bukebujotosez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=glory+ages+samurai+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000b0ff.bin
ce4f252836d346f046bbcc07650d81ddd3e79800bed8e3293e7d94f2be5970b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 10876 bytes
font_01_sfnt_off0000c9f7.bin
97220451369c6e7b483b46688569e9cddba7a23df44ae092f3b59e7981c8c1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 14492 bytes
font_02_sfnt_off0000ee50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes

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