Malicious PDF — malware analysis report

Static analysis result for SHA-256 598023f1b8934ee4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 20:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61ed6947d14a64d0fb97785742eb7fa4 SHA-1: 9f03f9fcd8e7c7f02ac45d0fbce2b96834ebd1a0 SHA-256: 598023f1b8934ee42d73c79b6d62db654b835810cdee93b0addcf8ac3621d50e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or callback lure. It contains embedded JavaScript and numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_CALLBACK_LURE' indicates the document may prompt users to call a number, consistent with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=farm+dream+mod
    • https://sieuthimaytinhcu.vn/upload/files/75471755973.pdf
    • http://consade.com/userfiles/file/fokalebipezuwekaveguwasiv.pdf
    • https://projekt-lesen.de/userfiles/file/nakagopetegalo.pdf
    • https://jobtiara.com/files/files/kudawoxuzubewefim.pdf
    • http://leaders-adv.net/userfiles/file/nagevo.pdf
    • http://vincentianssjp.com/userfiles/file/90919079336.pdf
    • http://dent-pro.cz/pic/file/kevowo.pdf
    • http://hzzxtl.com/UploadFile/file/20210917033738583.pdf
    • http://fge-service.com/userfiles/file/wenusizulokemawelaroj.pdf
    • https://dnmpaint.com/sdcc/images/file/8945778594.pdf
    • https://sushixusa.com/userfiles/files/66356583803.pdf
    • http://livelyway.com/ckfinder/userfiles/files/vuzavo.pdf
    • http://scro.ru/pic/file/14452268007.pdf
    • https://oferta.lt/i/File/56970162727.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161418f956f7f3---xotudujujizelanugut.pdf
    • http://jenan.com/ckfinder/userfiles/files/finolirijuzezazujivitasul.pdf
    • http://qdjshg.com/files/file/wuxaxofemarafenalurutu.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfea7e88b---48906177481.pdf
    • http://ride-on-earth.com/images/blog/file/dekedu.pdf
    • http://conditum.nl/userfiles/file/wivekapogozitoxivow.pdf
    • http://fiumaradelsossio.it/userfiles/files/72871444857.pdf
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdf
    • http://proxima-design.cz/files/file/57760135412.pdf
    • https://limpiezasinasel.com/userfiles/files/kutulitaduji.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/vobilirifavozu.pdf
    • https://diphong.com/uploads/38901463358.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_off0000cb1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 16792 bytes
font_01_sfnt_off0000e331.bin
7acc337ea68b72caa1d66f51f0b66e3c2bd91c9fed39392fd962b4e160f089ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16544 bytes
font_02_sfnt_off00010dde.bin
4a2e1e28ee260d43c34239c4c5392b273ef5d8b935c6fbcf68cf4811b167152f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 9876 bytes

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