Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b56108d79788e60…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 03:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e2767a5c406c2f0464b482dc1e495da SHA-1: 3b006aefed854c58f4fd6fd70dadab076a136866 SHA-256: 1b56108d79788e605b57838551f563e6ff9d86ca8a981b457efaf98333f465cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common technique for phishing or distributing malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, suggesting an attempt to obscure the true destination or to host a large number of potentially malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://truhlarstvi-strakonice.cz/files/file/74146560569.pdf In PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07274e374---75161400054.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/bevegarirovizuden.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/1860405251.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/vazipuvi.pdfIn PDF document text
    • http://cobmedia.hu/include/xiberewanad.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/7319204410.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/sowodifujujajuxulusamojom.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210911_D4FAD92DDE5680F7.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/panizimirezedamiverudapa.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/jusukujegepowozoleg.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/sigoropibekimirezofozowa.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/varojeguvutikupinawagij.pdfIn PDF document text
    • http://gr-chem.com/upload/files/59745794255.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/40546064267.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/2294754592.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/155995416761456cb57f8bc.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/vijonetiwunaja.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/397cidqolr1j49hiua4uiimec7/18506813471.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/85994138146.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/jusejakigej.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/10803085382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fun+games+to+play+unblockedPDF 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 18040 bytes
SHA-256: 3ed5e3dfe7328fc5e78c8901e240070db7b9ec0c7d08dc9b9ab4960ee1e5d8d8
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 11088 bytes
SHA-256: 19b3601c05e136fa24867bdf34ca64f8e1112efb698c3b0cb38a643deee11174