Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a20315810f3c54…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 05:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac7a3a1ccf651bcec55a728ddf52c1ab SHA-1: 3d3d741bb619e3d649217bd6809a53ea13f8e117 SHA-256: 56a20315810f3c54b253e5caa430f3c5474491ec263c06cdd205ca9150b2db94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=mammal+2016+watch+online+free PDF link annotation
    • http://hoangnamjsc.com/upload/files/83105364380.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/72425374571.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/fagozosunesaxiv.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wubenamim.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/1110070754.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c6e6055b48b1585ca51deef64959a3cb/17072370652.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/31394226618.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/35645188103.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143caacd0fd9---pezidi.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/bowutupenitodobapominije.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/32844444392.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/59820091337.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/1319641258.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/71073625081.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/82202609378.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/43306068781.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/25722585760.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/45990720223.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/94164264194.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijopafisaf.pdfIn PDF document text
    • http://hadt.vn/upload/files/venaro.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/16881699259.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 17844 bytes
SHA-256: d286c11a647fb0ab40a53c481c532231db0cf1431a03f63448c667695d7c75b4
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10976 bytes
SHA-256: 55de2d25951040579b42acdb0cb7d6b9bd44e22e9f241b730d92ea3f5e31e4d6
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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