Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaf1ec6153a5cb7…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 16:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 767920aa78ddd47d0cb4177af56f77b3 SHA-1: 4481916f1296c4c0dee46e8a9c59e8c9fe3904b0 SHA-256: 6eaf1ec6153a5cb7f2d09a35b45e232e5e0a6956e750ecee79a70bc0a565f2f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://laborke.ru/uplcv?utm_term=the+amazing+spider+man+offline+apk PDF link annotation
    • http://yasaitogo.com/uploads/files/navojitenabetuzeg.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/buvobeziladomu.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/47868127166.pdfIn PDF document text
    • http://chikatere.com/Upload/files/sisoxasufuga.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zolevebuwetekonixuxanuz.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nosama.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/1082299400.pdfIn PDF document text
    • http://parentini.it/userfiles/files/22610499581.pdfIn PDF document text
    • http://sro52.ru/uploads/files/8312506264.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/jozepigogalupumuwaju.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b221b7d9ac4cc065171462b85751669f/97491906001.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kewateponabez.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/20126397234.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/5588390401.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/7629755388.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazuzegavowamoz.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xinoromivedefobatimen.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/95183930151.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/97423477196.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/50426358280.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/55291983786.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/17036449602.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/18183923078.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137c802d3539---72603216820.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/5438911182.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/juvibujos.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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 10960 bytes
SHA-256: 2c985515490a06968b3ef81177ce158a1bdefeb7dc8c4b8578c3c92c6faa2011
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 18288 bytes
SHA-256: 388be47be41fe6c10921b667742a1d89cf3accfd46a03740a355d122e8e3a0a2