Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b0f4e0ef90a252…

MALICIOUS

PDF

72.7 KB Created: 2021-09-23 23:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0dfdaf62edd74acb6e1532ccf3206a5b SHA-1: 6446116e507f61e0a323d25d571e839e3037908a SHA-256: 40b0f4e0ef90a252a5ea898ecf980f3952590fa82650a09e3a4fc4375795cea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to link farms and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to distribute further payloads or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://kingsap.com/file_media/file_image/file/zaduvewokowuwiza.pdf In PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tirinadotuzuwixuxokegul.pdfIn PDF document text
    • http://klhl.com/userfiles/file/65153213649.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bowopowawibinurud.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/salagetetozuje.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101831377411.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/39586063171.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9102608718.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/jukozisifutakaru.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/wusumifonuwam.pdfIn PDF document text
    • https://educhina.mn/editor/files/14124266269.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/mukurediveze.pdfIn PDF document text
    • http://montesantangelo.it/files/files/62832985636.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/bomewowolawijitalubebe.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/51651203914.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/pixoduwejagosatake.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/36196537997.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/8496868765.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_6F82DA092AE2B60C.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/38415026580.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sexamirerilataburex.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411d24416d1---xekononik.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/lenefafupogiseg.pdfIn PDF document text
    • http://prompol.com/media/file/88269832399.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/5821549488.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/totelevebowure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=see+hidden+instagram+picsPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/87015259019.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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 15824 bytes
SHA-256: f02dcf3c08ca568c4489a6429c0aa58580e57413042bf3b6c0d994b3049e3887
font_02_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10872 bytes
SHA-256: 43f38789c0bca8ee3fb048a92e8ce6cd7826691c539b3055ef6fbbd7f2d54368