Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba52eb40a9a36bce…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 03:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ffa1bce8f323081eb6a76204fbbaae7 SHA-1: a4fd8ff9c672960903fd7424b946daf8b854fb76 SHA-256: ba52eb40a9a36bce8031c7ac3d3705269418ea2aad20762312a3b2db58a9c9a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URLs, many of which are embedded within the document's structure and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple disposable hosting links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://synerhu.ru/uplcv?utm_term=smartphone+in+bangladesh PDF link annotation
    • http://keyday.ru/files/files/raxaretexepaxidotari.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/60379206546.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/gawagidusijejivuxo.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021991430442115.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/rovegirofu.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/92115602610.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ranisajekujowagabig.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/85a514a9776830faa828098788f8c914/tozaraleguv.pdfIn PDF document text
    • https://ka-base.no/images_students/files/vesigakowenolasuzezoriko.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/5390374214.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/43385304054.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nirapowetuxazapawe.pdfIn PDF document text
    • https://guijek.com/userfiles/file/jepofosokikusipadibiko.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/laruwaxovozakojedapu.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/90375481291.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/56607322113.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/72907262381.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/53154931371.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/82780336512.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b89ee16019252a951e1f33dbb919732b/tetaxibugiv.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/jogujewaputiwiwofo.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/jufogux.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zuxuw.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/soluxalixafudoj.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/radapulajejebekovu.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/84882872676.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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 11056 bytes
SHA-256: 36c9bbdb32ed742da7a9e023d5e7cb278ef27e6488e3d177ba610a7580fc7964
font_01_sfnt_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 18268 bytes
SHA-256: a08661832b32879626f5c4230279a332c8f363d55ca7ce76b675abdae56881ab
font_02_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1