Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d2721ac6e36e2c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 04:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6b5fb7252c351203b70bcdc6aa0e2f3 SHA-1: 09241b7d447f65358bfcbf980c77656482b48e09 SHA-256: a6d2721ac6e36e2c3c5c2b039db18813abca1508c305b4dc8e11042364c6a89e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://tufaghanafc.com/js/ckfinder/userfiles/files/8961990218.pdf In PDF document text
    • https://mimpiindah168.com/contents/files/98963677713.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/15f8ae93a5aba22400201141deca6257/54265847173.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/55593070587.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/36949287331.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109190825111505.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/rosoxali.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jukupexujirixaduku.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/75025759727.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/vizanaliregafur.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lobowomosoborugotexat.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2e94f848f8d73615fe3d574cb3049b19/dewesibi.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/letesufavafixunokif.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/sojukepokuzepiwemapuri.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/rufal.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/katofepeg.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/zejuxuzo.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tonetagesebuz.pdfIn PDF document text
    • http://fnathservices.com/upload/file/bidadewoxojivupisojew.pdfIn PDF document text
    • http://sb-78.ru/files/file/mijezibebotola.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/zagajegexukuxipukumu.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/winiwoxopugolovubu.pdfIn PDF document text
    • https://anup.bo/images/files/faxemelibipufeditaw.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913171707.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/4838365030.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/jojimugepawef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+move+the+data+from+android+to+iphonePDF 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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 19124 bytes
SHA-256: 79e13d2c62a7b42c1805e28be4ddff9fc084d9ea6429baeacb1fc1dfef32944f
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10692 bytes
SHA-256: b17c6e45fc9f7eb57b1d890d0ca330c603523fabbcb9f8bdb29789883f653cc4