Malicious PDF — malware analysis report

Static analysis result for SHA-256 f725115f3c8bfa07…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 21:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8ca9a0c46cd06528d99ab3649b82034 SHA-1: aa591192bec43e2d58d05562006842b5ebca8452 SHA-256: f725115f3c8bfa0740a6f48136415e8ec4a7d5c7f1afb31bd65f9a167d6a0ca7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=send+multimedia+message+android PDF link annotation
    • http://midesignvn.com/uploads/files/74294053167.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/46134296341.pdfIn PDF document text
    • https://12tiga.com/contents/files/nasatureton.pdfIn PDF document text
    • http://youil.org/userData/board/file/98547741721.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/41408232881.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/sixiwubani.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/zinizisosazovexemoke.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/tawuvifo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d7e86dd6c495d3d862ed3ae63dbbd607/mewuzapirefirulerewolude.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/45024534389.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/2007367582.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/jedezutuw.pdfIn PDF document text
    • https://faceless.me/userfiles/files/binofovaviduz.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/68146711338.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/56073525178.pdfIn PDF document text
    • http://julianina.dk/upload/file/nozoxixaz.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/83231631729.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf5a62119---ratawebonunixori.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dotapobipekeboratesajuza.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nexipexazodenobod.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/lodororigifipixipovuz.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/nifutebomofalapalojulu.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/rivuburifes.pdfIn PDF document text
    • http://poiskvod.ru/images/file/75021840587.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/jusodebuduweta.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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10768 bytes
SHA-256: 4fb414a19606fe12d310f6775e7268c4f6d771748b4e5c29739899c6117b6e7b
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 18400 bytes
SHA-256: 969975cc61e0d8ff534199f41adf91cb966f867d280eee400001e023c3635d87
font_02_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1