Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78642c7af821636…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 11:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2a9053ae17c85ae9d2bd8d0b71a2bcd SHA-1: 2f85924ecd8ae5a85ae3216b563dad99575e51f4 SHA-256: b78642c7af8216361463c0accef443e4181c7a5f6769a93dac0a537948a7b227
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=rose+day+romantic+shayari PDF link annotation
    • http://lucchetta.net/userfiles/files/59298071244.pdfIn PDF document text
    • https://samowar.me/upload/file/mifodulijasivebijoxumopa.pdfIn PDF document text
    • http://hmed.vn/upload/files/sipadinigadow.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/dinuzemagedom.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/guvobunazijifek.pdfIn PDF document text
    • http://esistore.be/userfiles/file/jurikizajagubuw.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-8/20210908183841331919.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/90170787148.pdfIn PDF document text
    • http://freestyler.cz/img/file/70660612550.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/vigevigivuxerisudofas.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/65778847753.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/42092968101.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/vegalisi.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/wefegazunatitavunetifefam.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/penabivefov.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/86282575779.pdfIn PDF document text
    • https://mavibusiness.it/file/jonegobebo.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/42827058447.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/53876529852.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/pulukokopemanipiti.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161315b2fa40f1---63045571451.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/buvosozu.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_off0000af03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 14312 bytes
SHA-256: d40bfe60b0bf14f21ea962475b4b1cd5ce7b80440ca120ad1e75525d3de108ea
font_02_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 10748 bytes
SHA-256: 28b6714e550a6e8be17000c62ef8c284e86eca24d95557bf00eb3c07833245fd

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