Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd1d4620f0c4362…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 06:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7041b71e128ac875b61c90adb22ec1c SHA-1: 92cd55e99cdc2b839c44f47085402a1359afa18e SHA-256: 9dd1d4620f0c4362192072db43e569dfde5374b08deec7f9e4e87454ee52468a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, as the document appears to be a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=sat+books+pdf+free+download+2020
    • https://uleiuri.ro/userfiles/file/tuvibizikasan.pdf
    • http://shinex-auto.com/userfiles/file/29425427257.pdf
    • https://tcremich.lu/files/files/20437553066.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxifenitez.pdf
    • http://bscartridge.com/pic/46439815890.pdf
    • https://el-tall.pl/pics/file/35066318199.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/suzevuwurasamunujamew.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f38da0055---33614349335.pdf
    • http://darslaska.org/ckfinder/userfiles/files/55688778642.pdf
    • http://pro-group.ru/userfiles/files/94953587666.pdf
    • http://havefuntogether.com/image/upload/File/ganexoridodazabederir.pdf
    • https://ctapigroup3.com/contents/files/87103582474.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/bisuboteduwelelap.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/goradofojuvegutawim.pdf
    • http://beijingteye.com/upload/files/48764391665.pdf
    • https://krafteco.ru/uploads/files/mibuwaxekivajewovepave.pdf
    • http://itkaufmann.com/images/fckimages/file/karapojisugokulebodemoza.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137efd7954dc---98093875236.pdf
    • http://alotercuman.com/ckfinder/userfiles/files/99066884411.pdf
    • http://jiuxingchaoshi.com/uploads/file/020630049197.pdf
    • https://tarzminder.com/resimler/files/53790206283.pdf
    • http://nemochem.cn/upload/files/5831094486.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/widoselaj.pdf
    • http://inggeo.eu/userfiles/files/3717162082.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/58922253574.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_off0000d40f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 16792 bytes
font_01_sfnt_off0000ec21.bin
a035195630aaa3500cb109b84451fcd0102d63868079ae985206eb30ce7df148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16448 bytes
font_02_sfnt_off00011669.bin
f3f5366f2507584c39e457711ec95b0142a88fa8f8ca0246aca1af656aa996b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 11032 bytes

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