Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95268121cee0e32…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 14:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1718f4dad88e7b2508ce1a8f1df04d8e SHA-1: 22d520a7479af3f0f26cfc5378d3ceeef2bd47bd SHA-256: c95268121cee0e327744377831dcbb30234c28a6366f8069b0fd712b104442ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable hosts for linking, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://santehsevast.ru/userfiles/files/37436331792.pdf In PDF document text
    • http://nigerseedindia.com/uploads/pezawodojepe.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/xanikanevupovura.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/felupikufukoke.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/15464984274.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/pijitegilojimaz.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/14625673851.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1f1374e1---tovonore.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/polujobavu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/34949187963.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0cca7bd7368c356b5cd07b6284221902/78706158962.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/22562017867.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/56907980625.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/kefapegedujorerizowub.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/nupuwexawuvupevuremur.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/surarexomidi.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/39309331530.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/ronoredetigegopejemufet.pdfIn PDF document text
    • https://badoza.net/userfiles/file/dabodezajexubekiduro.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/jabelavabisi.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/33410545800.pdfIn PDF document text
    • http://domuran.pl/files/file/velibigunazilog.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/sejuxofapedoxolixena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dual+window+androidPDF link annotation
    • 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_off0000b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 10032 bytes
SHA-256: e9961dee12fa7b26c9c074037c441c7482eb3e7c16213c55f9dea00c0a2091c7
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 15848 bytes
SHA-256: 9cc3d6394bd31de6ee6e70e3bd76b99eeb6f32d705f85408ef0acf6e73d3e5b9

Open this report in the interactive analyzer, or submit your own file for analysis.