Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bab988b24e3b55…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 01:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae88bfc08d35a557d31f6ae5616bd529 SHA-1: fd74f4d102292aa33f66582802c768dcc1398bec SHA-256: a2bab988b24e3b55fdcf78742f276c1ebcd4364a2951352bdc4b3fef8a515b81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or distributing further malware. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or credential harvesting attempt.

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://wastran.ru/uplcv?utm_term=age+of+war+unlimited+money PDF link annotation
    • http://terezmisszio.eu/files/file/64132415933.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wajapegazikevevipag.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/24700627005.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/24219330130.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/zusiba.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/45602141302.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/27732493553.pdfIn PDF document text
    • http://apvn.info/userfiles/file/3866794452.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/gisejesulog.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/94627080656.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/kugupabi.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/ruvowowazovajum.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/zijovazunawewirufet.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d1701a3a---ludamibugomanawegusu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/lolin.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/83319281828.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/vowilonexenadizoxu.pdfIn PDF document text
    • http://builderall.info/userfiles/file/85627173629.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jupeb.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/46414931590.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/goxegobepexo.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/81022264841.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/960986698a30a9170c8eddc5a668b277/devatijija.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_off0000c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 16708 bytes
SHA-256: acd58f9bb2f893b497427c398a071cfa05e1702193f0f2992c6baa1240e2af47
font_02_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 10812 bytes
SHA-256: 38ac1cb7d765191b948e3d56f2db5795374a106f594991f64cbaf09d76944303