Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1c4a72dc5f8235…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 08:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82e8a47274952282c6ff9bcf70eed3bf SHA-1: 5398ce3e5a033531bd615f84b91773f7e152f37d SHA-256: 2a1c4a72dc5f823596a4aef282c969d7d6293925eef09ed8359cdcecd6ea5287
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a lure for downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=geometry+dash+2.2+download+pc+free PDF link annotation
    • https://leosservices.com/userfiles/file/sawixo.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/bosudeseradebumexonek.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/68336094399.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/guwape.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/90312560849.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/bijubetave.pdfIn PDF document text
    • http://arucax.am/user_images/file/93735091686.pdfIn PDF document text
    • https://unitjaya.com/contents/files/jutikolujudurija.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/vebuwojafexili.pdfIn PDF document text
    • http://only-svet.ru/upload/files/mirumanexeta.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/42496342120.pdfIn PDF document text
    • http://airzo.net/userData/board/file/73072808192.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/31156352667.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/konex.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j15dgj6n1h2ou877v195i0abp1/wunetelumilotelovovefu.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8585334858.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/favuzabamoz.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jenuwa.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/64099525158.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/10909771971.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/kemapasasenavanunovep.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902001215.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/36848063140.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_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 18888 bytes
SHA-256: dbfc719b21670e3068d3dbe24a7ef50854a2915f10148857972ac08eda783d8a
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 11216 bytes
SHA-256: f3458a32c43574a5beb8df285e3c216229379b9995137997c36888b7eaf0fe53

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