Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a1639d6ffc279c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 23:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92ce8614e07bc3555e9d0d195b9966a2 SHA-1: 68ea492de2ee7baa5333b13df33dfa3c3982ca17 SHA-256: f3a1639d6ffc279c5356940815444cd3ebfedd8104df2d0aa6a3e3637d088ca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the embedded URLs suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=best+android+auto+clicker PDF link annotation
    • http://sinoscaform.com/upload/ckimg/files/202109120235013899.pdfIn PDF document text
    • http://midospa.com/upload/files/zaduxujudi.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/60864711670.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/fomenepufuzozozat.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/pevawumepiwedu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7d81435---12992607105.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/24095120022.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/muwaxuzifugutibar.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/140666c04a35dc267e3425a4c470d3bb/nawobadabaguparexirixozo.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nevejevemetitow.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/43728191195.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/niwamibevu.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15582580253.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/61805293697.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/4725309172.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jogivisexefes.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/gakejelodiburivagibexolo.pdfIn PDF document text
    • http://wdnederland.nl/file/61036499706.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kemewos.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/94528229684.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wejuposulirakafeso.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/61557179258.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/52360715503.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/44035817202.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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 10608 bytes
SHA-256: 7a6a3d16e4b4395bcd1521d5bfa06442338efaf2d610d51748002b0e48f67c01
font_02_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 16880 bytes
SHA-256: 9185fd8b1474e38653104d787219979f7a44c88f9713196de2caea507f1cc5e1

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