Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f185b1351e155a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 19:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7e1660c361a1fd12cc08ad231f000e46 SHA-1: 1b417b59a23435b6828736607c7144994a89cbdc SHA-256: c7f185b1351e155abea4edda8459e9356ff1ecbd0132100de70c33e577d4712e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=pokemon+let%27s+go+pikachu+gba+rom+hack+download+english+version PDF link annotation
    • http://lindendirect.com/tempimg/file/38394368699.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wowizazenefokud.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/daraduwas.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613750cf23ef5---44484819257.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/54749133875.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/88275964899.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pofetim.pdfIn PDF document text
    • https://topupdana.com/contents/files/guliduge.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/37343504938.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/zububobanidagazaxuvuvoge.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/5860633761.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/80663935594.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/83645729150.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/74232352043.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/nedozovavodimitido.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/17529466552.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/45798254063.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/gezeradovotitusod.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/tozabigokinoj.pdfIn PDF document text
    • http://centronegozi.com/public/65244071781.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_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 17276 bytes
SHA-256: 0517528231770c00899a5ddb520225983b62fe851900a90f8682f6a0b7ef6465
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 11480 bytes
SHA-256: 817ddc8371a4de743fd5c2e2a80f8d195b6acacbc1fe1899456681330eb297d6

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