Malicious PDF — malware analysis report

Static analysis result for SHA-256 f194506505881df3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 09:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f406adc7a01b8889e8c2bbd8d693e0dc SHA-1: f2a545248a22bceb15f4e05df863cdbbe4ac5393 SHA-256: f194506505881df3cc66e09005d558594b3abbd4fc914cc607340152787164a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://marketypik.pl/zdjecia/fck/file/bikazubes.pdf In PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210922_141353.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/wewupumofirosivoj.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/78288313019.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/denigajegegenaberiji.pdfIn PDF document text
    • http://chinalabware.net/d/files/fufin.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/legopa.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimuboriwipofewe.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/xijewa.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/jelilikatudokob.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210909_083255.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/28fd87cf94bd6b9ee19ded8a4f491f47/tezukakijiwaxisanejovus.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147651bd36c0---metapabojamotanoke.pdfIn PDF document text
    • http://test-immo.com/file/vidajorewofipitofupi.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210911183427.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/4928565646.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/wosepivigexoninatigebego.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/lusutiduwivox.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/melopimevi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/31791004205.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210906025623.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/belojigufuxo.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/43893569897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apks+to+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 9844 bytes
SHA-256: 3ebe07ce18ae3fcca66a531f7d611a044edeeb313b299abcd6bd683a1bda2f01
font_01_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_02_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 21028 bytes
SHA-256: f700a3550af2188e9b08f8a9545ef57f1f71cf29f6bf465703861f9303b1f539
font_03_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1