Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e4af3796745dab…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 04:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ea0b69236e1df8b9a08178fafc3584b SHA-1: c23d142d9c1b5595119441f3d71e7582fd7b513a SHA-256: 75e4af3796745dab964a8c9bfcba4d9836063ae9fa6dfddc570607a7023c0570
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF structure and heuristic firings, such as PDF_SEO_DISPOSABLE_LINK_FARM, indicate a tactic of using link farms on disposable hosting to obscure the ultimate destination, likely a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=windows+7+rc+iso PDF link annotation
    • http://spadhotel.com/basefile/spadhotelcom/files/bozizepupidumij.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/vemaradixiwawiba.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/32722550902.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/pufafixudezakafodufi.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/zisaguminam.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98ac2987d---94072470935.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/kakipaxutasuk.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/xutibunatitadoruxumejilo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/df5cd8f30c90aa0705595ff427e7b135/13691985374.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/24690617218.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/71837872854.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/fegexokerotuweki.pdfIn PDF document text
    • http://maksimetall.ru/files/ridiwikavevamikowawod.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/boludonuzabofe.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nodudoliluzafaba.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210923_080143.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/pugumimosodusa.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/95405441285.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/nurovadotegurewisim.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/lakitufufizi.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/jerasafi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vajonidigivukekot.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vizinugejafagewofurafe.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/dikixenuvef.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 17456 bytes
SHA-256: 97dc73781fd714bf4890bed1f05c27ad5366d587f9bf63fcb5a5ae40a6905a63
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 10056 bytes
SHA-256: 03241ac9fc8061638f7f0b4478d28dfbdcc4453db88899835a7f9721dbd459ca

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