Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7bebcc57d029ab…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 07:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6ac450ee2dfa0df257a6d0be7405677c SHA-1: 049d5ec9253ff98b09d7063bf627918fcd163be1 SHA-256: fa7bebcc57d029ab8539c8b89851e3fb90e7ae2d310a830782974def32e2aa18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or spread malicious links across many domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'ML_NYX_PDF_MALICIOUS' firing suggest the PDF is designed to exploit vulnerabilities or trick users into visiting harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://apartmany.cucoriedka.sk/data/files/sukisumagunesirelime.pdf In PDF document text
    • http://learningkey.org/userfiles/42381153799.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vusejisujewodixuginapu.pdfIn PDF document text
    • https://patc.fr/imagesfile/10055438880.pdfIn PDF document text
    • https://webaprint.be/img/file/lazaxomodulagekaradore.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/55852859722.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/lowedoxizeleduzizotadixo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/32386001883.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/kovovemapebukedo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/58361625059.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/14450308131.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///76557001531.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/fomukezu.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/jipozepoka.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/75012166748.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/19112767940.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/24512696880.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/pijovijuborudukan.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/73112776361.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/68239822189.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/21611007709.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/77566647475.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf0d4d58e---tosomavof.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a74b2520234465f408b6dda045962ca8/najifodetojuzefilekofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=toffee+tv+for+android+smart+tvPDF 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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 10496 bytes
SHA-256: ce47771edeab81a34257cc567ea0e250fa0d0bbb5a2a88c3156ecddee4ae98e2
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16308 bytes
SHA-256: d21f26b7022af6b57225d3c35f448fdc726d60c1548aa22efdc1ef7f974ac93a
font_02_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1