Malicious PDF — malware analysis report

Static analysis result for SHA-256 40becdb2ac894bce…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 09:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff07d0bbf2de4f51d6fcce358526a8a1 SHA-1: ca89cc20e5f3d0570e5082f44425d414831cadd2 SHA-256: 40becdb2ac894bced9db79b1b3250704872ddd76ba75efd5d5e4a79f541dedc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious content, with one heuristic specifically identifying a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to redirect users to external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://simpelms.nl/userfiles/files/sisavefadimufunironekuv.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/69851507771.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zafibesidixokugafiw.pdfIn PDF document text
    • https://lecachet.fr/docs/files/36402711608.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/julale.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/19662132712.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/22351135108.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/45521157225.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904131941425247glvmng4793ea.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/mafikomuxodu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3157a20a---weninatawagepirifi.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/86821635273.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/nefokerovi.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/kezadojafalerototofumiwo.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36813097524.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/63458223799.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/84296798200.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wizekomumovorilosige.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/66089541968.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/73012403369.pdfIn PDF document text
    • http://dezis.ru/uploads/files/23249903381.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/zigavofonuwujop.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/foxinuzifofumedubadip.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109130827352190.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/pufaxigokezuwewamif.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/72888724193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=delete+music+from+google+play+libraryPDF 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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 11072 bytes
SHA-256: a2ddc7877022607c84ce138534ba8f61b6016ee8d89e6565610edd0f6122723d
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 18060 bytes
SHA-256: e9348417c2bdc10bb47385434187ca103823a98fbd8562594dd9d2e97e355fca
font_02_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1