Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17bbffd44d97856…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 16:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd3d3c89c3f01aba30a8e6cda364eb4a SHA-1: 32923ce9e3f371c73f76de94fde3dc9d569b933e SHA-256: f17bbffd44d978567cc00fa15b362aa6b8a968a550b11e4887941bbc7b9ea4b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan characteristics. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, suggesting a phishing or spam campaign. While no scripts were extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sevennews.com.br/ckfinder/userfiles/files/nekuzugobewa.pdf In PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/76720923594.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/vukoli.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/vemiwidinoru.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/jaxapudamelan.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/vowetesalodad.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/28275009334.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/forejezaz.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/batizivojuruketusonuriju.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kejifaruvolegiti.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308b028210f---wapixopifeg.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/43e253a20d39eb3856716a4968a73d5e/wajaz.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/wazugezezape.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/40361752396.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/metisifop.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/jusepanipavukixikutene.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/55305965921.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/mabawux.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/pisopudafapoborodewutile.pdfIn PDF document text
    • http://kleiberit.ru/files/file/30831289211.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/gafozaganifekawidewev.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/99704121775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mitsuru+marin+karinPDF link annotation
    • https://easyown.ddproperty.com/datas/files/94365345308.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10156 bytes
SHA-256: f0ae695797ddcc772db4f63d75c385a4ed04701db009660d517807cb38c0f0d6
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 20120 bytes
SHA-256: 0bc5ad862a20dc6243a83c51bf2c72bddee3c96042282e5ef145dcbdc5398e0f
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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