Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ab129589a34c24…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 01:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5137f77b76467dcd3cbcdd0d31d19692 SHA-1: 431a7b7d44f281d12acf1c42299769c0ee46a002 SHA-256: f2ab129589a34c24d76ebad76b6b1779a0f415df5ac158c83afce711e3f1e2ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or SEO manipulation scheme. The presence of many unknown URLs points to a distribution network for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mvmdigital.gr/files/files/50296027219.pdf In PDF document text
    • http://agt.es/files/galeria2/files/34182563699.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/lasotosenawawid.pdfIn PDF document text
    • http://rococosofa.com/files/files/sudagamadabuwad.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/zoxowevuwumozekulugi.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/18800970605.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133966f9eb27---foresukafojamalefigegaju.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/58776902858.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/rutogonemonigukifu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/55197555478.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xasomibuxaxisevubawululag.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/77818787669.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/29536117153.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/pofalerelomosu.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/31138324488.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/79383809983.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wafixab.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sd25nsgaossuh21i1v6q71oc63/49362893134.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/55800703593.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/refuzodewudunubepabapimiz.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/50115873773.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jijaniredobuxalugufivi.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109061520423589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cleanmymac+x+codePDF 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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10320 bytes
SHA-256: b4bc3ef352cea5ee519d8c13de53f85497fa0a75f82e7ca68bd60ad7511b38b3
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 19052 bytes
SHA-256: 9a8fd3ae1c00ba6094ec15481ff3ce18a9effe436c597da8f94b3ab4c1544497
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1