Malicious PDF — malware analysis report

Static analysis result for SHA-256 5222f8246697d432…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 23:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef79dd2ecde9550d6ac75a1ebe10de4 SHA-1: 0ff03bde3f0b8aeaaa22f0b677fbb9943fa94a6c SHA-256: 5222f8246697d4324e476cc0abfccba7f98e3701c2487777cb23dbf4ad7d2b4f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to PDF files hosted on potentially disposable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malicious content. The embedded JavaScript likely facilitates the execution of malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://artecgroupservices.com/imagenes/file/vawazasezokebo.pdf In PDF document text
    • http://alianzablue.com/aym_image/files/zotokegeni.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/58627201200.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/joxuvibakivudejesawobur.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/bizakesalo.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/jopasaduzivijuseza.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/nilowajanebiweg.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/14323748235.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e193a0bf3---takudagejalawotux.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/20597033644.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/11190781200.pdfIn PDF document text
    • https://virker-ikke.dk/files/43382621655.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/jetem.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/wajupurateko.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/pisuvegezebek.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/79517437794.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6b8771f684dae81b24ca75c22441aa48/98394650026.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912015652.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/45191343046.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/47193608394.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/jodadevizugusadigama.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jorufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=among+us+hack+for+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_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 17052 bytes
SHA-256: 74697ed806430a9ace76a494c433ed478ea198e4faf8c9ebb49c1ef75b86f799
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 10956 bytes
SHA-256: 05e462c0fdb0ac3b72231ef0b2c35095c9e04a321a49cdeafaf9b34e83538926