Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b455902897cf1d4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 20:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07c33ccc1c6069d47eced441a1211d76 SHA-1: dae405ad13c3b2b859ecf46de753ded40d08faed SHA-256: 8b455902897cf1d4d6ba9bb0f6291ff7557f1cd20bef2bb7f9cff60f80a962e3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seasonsblinds.com/uploads/ckfinder/userfiles/files/94923216790.pdf In PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/tavoludus.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/62403249689.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/47780571556.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/zutomiz.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/tizebagojasuxad.pdfIn PDF document text
    • https://auto826.com/uploads/files/54984224522.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/84361063446.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/51467564896.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/85015402848.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nitilabipoxelodasuxesi.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/19896344676.pdfIn PDF document text
    • http://raczcsalad.hu/files/64029432597.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zigadugozizijoxifuxa.pdfIn PDF document text
    • http://onelove.cz/file/12279683271.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/76276730481.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/vesurimaxupaxafuwo.pdfIn PDF document text
    • https://penal-garazh.ru/files/revopufa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37b7daa77---66256967972.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/ziwikuzozesefawenamubopel.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e426046b1---nifotugowidokumabetiwikaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=real+steel+wrb+apk+modPDF 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 17248 bytes
SHA-256: 7fb28e1cf60a78498c2d5d4e641117958f2d819ddb09f43537d98aab91e87e1d
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 10720 bytes
SHA-256: f48fd979279257615bfa50804426c5a51aede6f9f9308c6f1ffde7a210ad40ae

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