Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70505b36100308e…

MALICIOUS

PDF

72.2 KB Created: 2021-10-04 03:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2cb805be5f3f059b0513ca72a070afc3 SHA-1: 9787e93d1dd6830fb5264fbb37310fb3fdb15f73 SHA-256: b70505b36100308eb53340da7830c2fd663924f909eb78fa2de30c9c0a470a3a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains 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 embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=chaucer+famous+works PDF link annotation
    • https://behbehaniprojects.com/uploads/files/1932233782.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/46465498594.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/031658134145.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/98317265008.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/3514625865.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/74404910753.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091816132066.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161521c245f77b---zuzosunuxopexusog.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/livalu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/kezububobebujo.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/jofit.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/15155424366.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/61188438283.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/10999687696.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/filenudaloxelan.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/wabosuselimisowusomopa.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qtn84a1vrt58n0cvfc3ehe23s3/22826456592.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/viserazisagarozeb.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/buxodokudo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vevovuxabeduzej.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210902120520257.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210926111423.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/texajenu.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/nevisujibom.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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 17796 bytes
SHA-256: 6f5ad77b635274953c17ad3a107535e7662b9e7dd0848f0e1f0220a68ebdba77
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10568 bytes
SHA-256: d12da331a508009ea5fc2d128e5bbb31e4010083f5bcef263521cae4b792d571