Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1244fa529673814…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 15:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef9139bb68ff7dd8b9433494662b8847 SHA-1: e62fa3d667e4c1ce5eeb40823be1b4ce8f5718b4 SHA-256: f1244fa52967381430f160bd4f573001e973f33f384cd4696d3143518902f707
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it employs social engineering lures, specifically a remote support tool pretext and a browser extension installation lure, to trick the user into executing malicious actions. The document contains numerous external URLs, suggesting it acts as a downloader or redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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
  • 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://crewmak.ru/uplcv?utm_term=control+other+phone+using+my+phone PDF link annotation
    • https://korzo-galeria.hu/files/file/naxakevewerep.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109091916035137.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/13091486338.pdfIn PDF document text
    • http://montesantangelo.it/files/files/zetalojag.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/rumogarujunemetazifekat.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/16515391340.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/salonutizufujixa.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/nigeganuka.pdfIn PDF document text
    • http://skisun.it/userfiles/files/22736559189.pdfIn PDF document text
    • http://mestan.by/images/file/rireparulo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446c3a3c7e0---99445825646.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/goforufitilaferebawisabem.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/maratazijopalaj.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/laliwuliras.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/8987536011.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210916203323.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/gisepazejoxoragaril.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/75700125661.pdfIn PDF document text
    • https://people11people.com/uploads/File/topozopilamelanaxegonolub.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/33267983796.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/76244025777.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/gujiledubu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ada8161d---54160471530.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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 18384 bytes
SHA-256: fc21a3603c67622a8c8cb4681ccf895a47032704d8b2eb0b1f6a00e1e3b9aa00
font_02_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 10780 bytes
SHA-256: 9098634df2b755eb0877d11633dcf5d55c66a3d1dc293760c6ef2b593c5946d2