Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4fd8fecfa7eb26…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 05:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37527fec9552c71160056ee57e8b8a6f SHA-1: 21cf4d6ca5720538e5480373c32cff5639e0d2d1 SHA-256: 8d4fd8fecfa7eb2647abccd427235572e8c7f2728eff0d6aa05402a646bea072
166 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it uses a browser extension installation lure. The numerous external URLs suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a social engineering attack designed to lead the user to download malicious content or provide credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://inwebjor.ru/uplcv?utm_term=how+get+pubg+uc+free PDF link annotation
    • https://takipcisec.com/calisma2/files/uploads/buxijogovebagase.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/427141490.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/memerarumelen.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/50476018205.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/15769516116.pdfIn PDF document text
    • http://autovoda.ru/upload/files/89825314424.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/81028403021.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613619802c2ed---venirojezuvubagobekinezik.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163125414231.pdfIn PDF document text
    • http://apcmagon.com/userfiles/jabemabolobevuzevibabub.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21ff62be3---fuxol.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/22428252218.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/36862640092.pdfIn PDF document text
    • http://napiarsaigh.com/images/tijid.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/99791725200.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/96221603367.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced544c58e---46761349337.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/tojikosebub.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/beduzijopurasegofirewaxo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/77838510798.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/74360677287.pdfIn PDF document text
    • 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_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10400 bytes
SHA-256: bf0ecea9eade2c2aaf3bb3cb2ac6d72853df6471b212a29cbf32fc9114fdcc9c
font_02_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 18712 bytes
SHA-256: 24efbcb0a2952a8cdc22452c8f82f679a9fda627e05fd1fa772463cd21cc7d2d

Open this report in the interactive analyzer, or submit your own file for analysis.