Malicious PDF — malware analysis report

Static analysis result for SHA-256 f567c6a2db889bf9…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6ee7f17d23f20651f8b696b23f945f5 SHA-1: e9ab2d1ebfbe63c1c241510a4082771d76ddfcee SHA-256: f567c6a2db889bf9e2833432f1495a345e4748fd8dda01635a5671af8425e9a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ubk-sad.de/azubi/userfiles/files/tavezumusuj.pdf In PDF document text
    • https://safrano.pl/userfiles/file/21589860570.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/24663420365.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/96337045272.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/70548497936.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/zuzewemi.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/55375118220.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/wujoxedoladuronadolesasad.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/99446013638.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16152bb3d980db---mexolotalitevakawu.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/vuketeni.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109170548069124.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/45152449669.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/domamadapijowilutibugozo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/dcc0fac9599e20313d36b46dc18322ee/gafuzixomebaxewem.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210913/files/20210913135100.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/67546728939.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/73419125264.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/26458585283.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/sunevudipupizudusegis.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/maxofadanotalufisikisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+rules+of+attraction+book+pdfPDF 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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 18160 bytes
SHA-256: 7c6e2fd73bb470e003cd0ffc5dbb648cd5a2bd3d934bfac6ced3acee6599a3f3
font_02_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 11012 bytes
SHA-256: 8a3dee70958264fd6f6961fcaa2e34bf4b16f180a21e0e2caaac319b6561ec2b

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