Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2704dd84554c64…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 12:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bbf4138d17e628e05b626cb1bc84d69 SHA-1: 155204db5a450b91476a1765fd83fbd00906c759 SHA-256: 8c2704dd84554c64b087f26003e306297cd7d43dfcc409109923098583b3ab77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cellfruits.com/ckfinder/userfiles/files/78739966487.pdf In PDF document text
    • https://dnm.tw/uploads/files/202109120348363651.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xitozexolesa.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/pepibalutetaxokila.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/joropuxitusolixijelawanin.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/wakimijadawiwixubuvama.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/65602579477.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wiribudizosubedano.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/93639336309.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/18045124494.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/54583465262.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/tuwowopezepaxunigumisil.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/99490695393.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/26251176700.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908050359_346273580.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/xukapefu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d0cf78083---64788338598.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/karusatakobum.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/14600331208.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/99884188599.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/nanidufimiruxuwedixujow.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/84589700164.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/95962548135.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210917010306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vfly+online+video+editorPDF 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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 10168 bytes
SHA-256: 8a5c4063673b16fc23d2f92630aef700a584504a8ddcae3538190a3bf2e8394b
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 17444 bytes
SHA-256: 96f75b44438708b055a6a3a255a3cc49fa9eee163e298e52647038bfc6c78559

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