Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b750ca7f234e8d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 20:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bf5bb373393dbe4bd1c1e06406dad58 SHA-1: 4fbb50e4a50e1f1c5db68649ff102958026adb85 SHA-256: 63b750ca7f234e8d23bf4dcd93f528889b9a3c3014d26252e0e60c6e5ff9551d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or spam campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=job+application+acceptance+letter
    • http://absolutelyneon.com/userfiles/file/lutigagasutago.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/75763318858.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/vuvigejuroxa.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/70931473544.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/9254491328.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2de6e6f62d2eb11a404a180f14115f27/59024065455.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozir.pdf
    • http://marikitaberbagi.com/userfiles/file/wuxisigejerimevom.pdf
    • http://vector-food.pl/userfiles/file/likefizafesoba.pdf
    • https://genia-groupe.fr/images/files/xenavulonevepinobutevij.pdf
    • https://dermatologie-chamonix.com/userfiles/file/darutajidifupasadijidoval.pdf
    • http://viettelhaiphong.me/data/dulieu/files/sewar.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/11381480850.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9371387c0---seloxidikizejil.pdf
    • https://oxfordjsr.com/userfiles/file/56566556674.pdf
    • http://warwick-ems.org/userfiles/file/dufipi.pdf
    • https://rusepress.com/uploads/wysiwyg/files/xagamu.pdf
    • http://omonetach.pl/foto/ilustracje/file/vodososawopotemoluv.pdf
    • http://unicorn-furnitures.com/d/files/tukomesum.pdf
    • http://nfrostov.ru/upload/files/37017454843.pdf
    • http://dichvumucin.com/upload/ckupload/files/wazodiwikowosimepeveb.pdf
    • http://thedewakohchang.com/image/upload/File/5027120268.pdf
    • http://phongthuyphatloc.com/luutru/files/muxufadoxafako.pdf
    • http://naturalwonders.com/uploads/files/37788676536.pdf
    • https://wecareu.net/ckfinder/userfiles/files/83352553111.pdf
    • http://manisafar.com/basefile/marcosafarir/files/26787388887.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_off0000b09c.bin
b3611c102048aaa1f2911341f67955032c7e7a0f6a9fdf109be62b141296c96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 14808 bytes
font_01_sfnt_off0000d55f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16792 bytes
font_02_sfnt_off0000ed76.bin
08c7c052aa53207dc27cd21591e657e331a953029235898003c41e0e7a19be5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10332 bytes

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