Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7394e43ea2669db…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 20:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b896a81e1a894efca3c77c8c8a80da07 SHA-1: a07af02b141df7ca8e210b6c37a0184453a828bf SHA-256: f7394e43ea2669db195cb831ce85bca4ed07c1691a500eafeec0e3b50f50e49e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or scam attempt. The presence of external URIs and the nature of the heuristics indicate that the PDF is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=how+to+restart+android+box PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/53190819652.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/tegutujetuxezew.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/xosezedupabigetelezunazum.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vosadivabowakanavo.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091204473074.pdfIn PDF document text
    • https://iwistw.com/upload/files/29808891612.pdfIn PDF document text
    • http://liluby.com/upload/file/35522844351.pdfIn PDF document text
    • https://777mto.com/contents/files/wumomuzoli.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/lezukokovukimelumotovemu.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31977936701.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/telaxodefojizituda.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338f9f5cb41---fiporuponezarekuxunejuk.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/zasedemezisakomij.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7313e923bf579827ff94736509fb1ef/pesubibixivu.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sitigu.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/xegabuwubunodigijive.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/lawidurebulamegas.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/81870418892.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/nisudisaguneli.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/95189300785.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/rajunavivegexa.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_off0000af0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0C 15060 bytes
SHA-256: 696bc308ce0f94178980461ce237de5fad5a318350df5a5c3cd6ac401beab9eb
font_01_sfnt_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 10512 bytes
SHA-256: 3b962b8d7629515421d4c51fbdb0daf5731a851e33eb440f07ce771d4689a449
font_02_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1