Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc598b30d22a6a12…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 08:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dda6060f6423a150f2e478b517bf1954 SHA-1: b16c43a6e7811fd817686e3f67af5618cf01f880 SHA-256: bc598b30d22a6a12d0d3c8496b67b1a470316297e6a0d3c02516d4851dad53db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the presence of many external URIs, some pointing to unknown or potentially malicious domains, supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ozhelalikram.de/resimler/files/80506225584.pdf In PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/bepifavuw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ocu86b643l7r855gsvpr6d5vnh/dexagepedine.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/rofagumajuvofemet.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/xezonogufev.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zadunurefubofaxegaki.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/xefavawerewafope.pdfIn PDF document text
    • http://teplospectr.ru/images/files/75613158371.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/dereb.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090204110555.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/kotelumadiwenodopapuro.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/gutux.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/musavupofakizalonami.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jenaminipoposubokifepa.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/80690455944.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/lobalaweporojubowubobikex.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/29513123338.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/40699418965.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/vodapedopewejujofebak.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/tifopobavajixunopuromevog.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139edcd024ea---9704770207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=problems+with+google+calendar+sync+androidPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 19040 bytes
SHA-256: 58fac64dd294ec28d86c53330e30795fbe2f821d3b98153c4343e29f2392b6dc
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 11160 bytes
SHA-256: d37d7f78e6a861503f3d21c03bf556d0f228e4a55d739d05353658c7fab37d0c

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