Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee51aa9f323674e2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 10:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5425cce0533dd2575c030a5c00706dce SHA-1: 40d5318b839a0c4e947c810ada5f1e3c90154abd SHA-256: ee51aa9f323674e20f23f7da3c3bde3afac9f68dadceeceabb73251b3c985a9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cambodiadriverservice.com/userfiles/file/jugimarigewidan.pdf In PDF document text
    • https://gopherscopes.com/userfiles/file/tulaperimuxawafexeres.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/galopojexivaweki.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/kejoruzu.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/83526162066.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/zujotidunuzudone.pdfIn PDF document text
    • http://splogservice.ru/content/files/nobikowebuzajofijixufe.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/57265276611.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/pujevatekiwir.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/36678293410.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/xelogoderivuparofobax.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/61697618126.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/54745115090.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb79a21393---potuposozibubazup.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28af53511d90ba956c9632d20f9905e0/7573033451.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/simaf.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/nifatanulogop.pdfIn PDF document text
    • http://szm.hu/userfiles/file/korek.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/23971596036.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/27566834176.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/51193621348.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/kuzikiwozubolebusuv.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/32213288712.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/78449840383.pdfIn PDF document text
    • http://canoeing.by/pics/files/dopawamuravezegozilavugat.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/74338780979.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/tobodevebugir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cricket+mazza+apk+downloadPDF 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_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 10776 bytes
SHA-256: 55ebeb2c6d0d41a1f315904b115390267eae87484023a637f7f6129871de763d
font_02_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 17972 bytes
SHA-256: 864c022a42f279dcb2ba52ef25aef03560e5404baf00d6b7917c97950cf600a4