Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7de7d0abbdbe138…

MALICIOUS

PDF

86.1 KB Created: 2021-10-10 02:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 43b695b9e626480b001c7a0f3d9a0db8 SHA-1: ab3c56861bb1796f0c00b71c469548f8d1907b21 SHA-256: a7de7d0abbdbe138a72ac2492530751ec00488690ab9b538a511229a16c850b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=concept+of+object+oriented+programming+language PDF link annotation
    • http://quaisetoiles.fr/img_pages/file/nakuzineduweja.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/pulamaxofodobatugalawa.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/53670678675.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/disivurozurisa.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/33428099010.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/46877544097.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/89571644905.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/57295713016.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/14317175499.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/33291669491.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909105324145597.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/39188919472.pdfIn PDF document text
    • http://haqwali.biz/files/file/13367323842.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/zoropelimo.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/kisazesow.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/fuxanogikidegilemukamoz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e183469ec---21713155963.pdfIn PDF document text
    • https://kede.org/userfiles/file/55102365760.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/lojifisurukuzepip.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/zaxexekolari.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/91341188520.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161424bcadc0f2---86267869854.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 18448 bytes
SHA-256: f99782aa6194f7be7f0854193f5302844979355b3d6afe98b790dc8619861000
font_02_sfnt_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 11196 bytes
SHA-256: ad750714f985529baeee665cb34d99b72e9cb2e0c17465bddf2b2ef525d6fe10

Open this report in the interactive analyzer, or submit your own file for analysis.