Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96d7a83f7469a42…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 06:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b3afc62f70845e79a85abce6c326d9e SHA-1: 0f803675653fc3c412f5b63f7a00e3bd284222dd SHA-256: a96d7a83f7469a420225d774baad4b4c4c519b69718916dd7b67da9eb5b1fcdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://beautifulmoda.com/userfiles/files/gopubiwukumineganid.pdf In PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/punufavedonolijodubujikiz.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/8247593016.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/xopegezopagab.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/78001862130.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/52198661030.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/82996892666.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/56891975009.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/gawepezowexugeniwupi.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/pazibexemubot.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/nelid.pdfIn PDF document text
    • https://ip-pharma.net/data/files/josawavarusiduj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134879a87200---47508313544.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/bezimoder.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/90236540750.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210905161424.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/94209287967.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e98a7996a---20221243609.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/lenol.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/babavoluf.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/16509548758.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/fenurapegorife.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/15249556659.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/zodejobibubowinosakegoven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=create+pdf+from+byte+array+c%23+itextsharpPDF 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_off0000b8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D2 17180 bytes
SHA-256: c26f9efd12906c7a0041c376b2993ac23e3d81f6420cfc4e72d547753edf6287
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 10656 bytes
SHA-256: 37d4e57d3b8ea22267425971893d5f62c1423b25a5088c0fac65f4e96ac227e9