Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bab313e9471545…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 03:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92ded2abc4a925682c0dfe8574ef0444 SHA-1: 22fa09761af6639f0c4c4050ca00fa43f44bf037 SHA-256: 66bab313e9471545646b0a1965fe67ab17cd5d93cac047865003da31491f1093
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-only with a click-outward action and a small file size. The presence of numerous embedded URLs, many pointing to disposable domains, further supports this. While no scripts were directly extracted, the ClamAV detection and ML classifier strongly indicate malicious intent, likely involving redirection to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 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://curry-box-deluxe.de/userfiles/file/4420679436.pdf In PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/batajapuv.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/kutevejajadur.pdfIn PDF document text
    • https://kimcert.com/E/file/21542895561.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/mefinesugizaxigitubizofab.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/74026869633.pdfIn PDF document text
    • https://adikkedua.com/contents/files/98306526404.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/32603445919.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/35691253850.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/69330093727.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/4414793661.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/wibutaxekorigakik.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fozusobeli.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3638ed2e9---96354707782.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/12398263257.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/pexuwizegofawuginavid.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109082102124628.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/37448923244.pdfIn PDF document text
    • http://islandpointfl.com/userimages/luxitimeno.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/23474107922.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/majepepen.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210909100303.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/juwitilasalojad.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6bce8720---35920139798.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/birepenoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+restore+the+deleted+pictures+in+androidPDF 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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 14152 bytes
SHA-256: 8f0dcbe42a9edb258bbc5c539c0ae86df8468fe54c25c6c4654d1b441168a06e
font_01_sfnt_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 10788 bytes
SHA-256: ddde07c086c295ae3c28d731e9d603bd8ed3086945ab2c8289fc24876604db47