Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d33e3efe592589…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 02:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7287c179767fb3b560fd51691e494ff5 SHA-1: 8610e5e2c1d6f49fcf3c879f8b470d0b7727b2e2 SHA-256: 56d33e3efe59258952415dec22626b088e423cacb969f98e24f952a1424e2b40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate a likely attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/libafozariduvosobozo.pdf In PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909051912368929.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/wofebezifezadalazi.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/suwunupovakozerekosoj.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fupewabuxekikibewovumomu.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/30981593194.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109072312535778.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/16638515830.pdfIn PDF document text
    • http://iucecb.com/files/file/22389398634.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/54533402452.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/gebezoxeliliwoni.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/jajuvexegovito.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/milazip.pdfIn PDF document text
    • http://rayer.cn/d/files/nabomapelumarawodu.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/tuwivijewire.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/reberubotolomono.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae8f5b1f0---39923723577.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/lapotegipoduwule.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/xiduwawotigagujoruvanitax.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/79738754603.pdfIn PDF document text
    • https://rippa.pt/files/file/sexes.pdfIn PDF document text
    • https://kham.vn/userfiles/file/bexoletujokib.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/96756741635.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363196b3fad---sudinomosevimuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=clubcard+tv+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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 16324 bytes
SHA-256: 33a9a75b3d158cb01a2e390ec4bc01d03b2908f4e8075355ccb0064636ca54e3
font_01_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10400 bytes
SHA-256: 323dffd25898614dec495875a13e549038dfded0c470c26f55d81454de4516da