Malicious PDF — malware analysis report

Static analysis result for SHA-256 19731aa03829e79b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 09:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: faf912371df5696fae8c4fd20596570d SHA-1: a85852b6fbe5cebc29ff955bc34e538eddf55968 SHA-256: 19731aa03829e79bcac7e3d931147132d1ee86dab3b493364312d5e20060f1a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The presence of embedded JavaScript points towards potential execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cosmopolitanhotel.eu/uploads/wysiwyg/files/valigumonunevuladaxoveni.pdf In PDF document text
    • http://yuanhebiotech.com/upload/files/sefela.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/labelufebudog.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gexopajejipivipevadidav.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fukusivunabodowedaba.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/26696942293.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210920_C9CEA615B53C6D9B.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/60171478262.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/1707420733.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/wukivigizaref.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/91913433318.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4c2e52db3936bfa73cbae35ca787fd43/lepakepozovobejo.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/8538305680.pdfIn PDF document text
    • https://training-access.com/upload/file/nawugopuxaxogujubofedawi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/wofoxafigu.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/tiwuduwazowifozotik.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/matori.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/dofutam.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/68575317547.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/89995095861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=black+clover+volume+1+pdf+downloadPDF 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_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 10872 bytes
SHA-256: e8eaaa6036069385bb39c0579143efb3a6dad48969b0a2127ac8b43bf1265ff3
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 22420 bytes
SHA-256: 1e27cf9959581e0fe594b399df0736b89732586e57fe5feb50a539af629aa04e

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