Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cef11fb94f5487…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 05:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 00b5093ea3fd1d2a025c46eb275d993e SHA-1: fefc0417c6aebb2d0adef1d7ae2efd4c9989c905 SHA-256: 07cef11fb94f54878b8d46e4c96bcb2c91b5130764c923c6fd3861a41a2adf7b
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or use a remote support tool, a common tactic for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded links point towards an attempt to trick the user into executing further malicious content or granting unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://panificioilcavaliere.it/userfiles/files/99257131745.pdf In PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/21046764972.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/zixerewejotemex.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/geripito.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/nuvugaj.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/babugawunogadifesova.pdfIn PDF document text
    • http://abwessex.com/uploads/files/89113847919.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/5429439709.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/65010292027.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/22565342115.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/jixajiwol.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/43250896676.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/sebevizugava.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/63249997779.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210917_1039BE6AFB0A2968.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/pusogufakip.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/25086318637.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/95876545802.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lujusirisajedomigexafuna.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/31261200177.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ipilekizesemi.pdfIn PDF document text
    • http://usateatop.com/_upload/files/94316834150.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b46c7ae72---wutusaniro.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140621e59eff---47432405241.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gibufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wallpaper+hd+1080p+free+download+for+android+mobilePDF 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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 17708 bytes
SHA-256: 5ec462592158a7a2ac037a4f0bfd037cff7c2d3d97bc35f23031e40c12584212
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 11100 bytes
SHA-256: cf9dff85e77c116822adc69b1cde5950c1590b97e07f4ea8afc39d781ba8fa84