Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6615dded91e42…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f54a70fac44012b4698fb9aa49572b94 SHA-1: 7436826acf3facd7a57a46dee368e7bcdcdd874e SHA-256: b7e6615dded91e426165de100bd31ffc457f4c9ec6a97a2dd8528e0b024a0a9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://alamansyria.com/userfiles/file/wasarobawevor.pdf In PDF document text
    • http://yule-sign.com/upload/editor/file/20210916060620.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63716294572.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903020001.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/xolije.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/fibem.pdfIn PDF document text
    • http://4rrecycle.com/files/file/tosafaxisulowi.pdfIn PDF document text
    • https://wita.lt/images/files/tesivagizemi.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/widometuligilawarenesi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fuzazizolugumitutig.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/kijisiwegemopugub.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/3185749738.pdfIn PDF document text
    • https://medtek.vn/storage/file/mamisozabikojujetuwapidi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/segivilabomiro.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/berobumawelopizefexikepe.pdfIn PDF document text
    • http://geraldinekilkelly.ie/42603096335.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/buleguzajob.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/15259000229.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wekaxep.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/18416174556.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912111311266918.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c22af1e3e---53402789716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=harvest+land+modPDF 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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 17392 bytes
SHA-256: 5ea8675353dff497b9bfae60b80a2ec35cf620181b7c354768114a859d705420
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 10376 bytes
SHA-256: 31a09069dba54594197872d00300315b967344c92cebc3377268dc5413624577

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