Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff5b6745ddc064e…

MALICIOUS

PDF

67.6 KB Created: 2021-09-17 22:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0818e4a6a5e02933e78bcfda28d98a82 SHA-1: bc3bccae5d5139fada00541a4721920fd9876605 SHA-256: fff5b6745ddc064e9ae3c7af5d9e4d694b93b9ba1ab6026370e0c940670c043e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing trojan by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only document with a click-outward action, typical of a phishing lure. The document contains numerous embedded URLs, suggesting it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ccadl.com/files/20210914122747.pdf In PDF document text
    • http://warehousetraining.ie/images/86098868766.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/35565493297.pdfIn PDF document text
    • http://retailcop.ca/files/79365885377.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/mefelaxe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8af2bba2---bilaze.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/7116128827.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/216f27718c378258994ab9b6357921e6/17250971844.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/fipuvamagujivago.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/69754165587.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/jolinilaf.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79519746567.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/jazakuwoje.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/20218184472.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202194614556597.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/12837200991.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/temimasakan.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/xasusinuxilikiporog.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/barukifizubafe.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/tibaxupewodesipofixajoxer.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/81672802356.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/jinulemow.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917232254.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/49539887189.pdfIn PDF document text
    • http://citra.cl/userfiles/file/defanuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cool+reader+android+downloadPDF 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_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 10092 bytes
SHA-256: e42b8306195f10dcf61a76789f433392dd54d69769600c3c56ae1bb86b10b375
font_01_sfnt_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 14204 bytes
SHA-256: 2ff37822c18979e10268b084b5c06414134285816fc6c2c4af8878adf397e2b5