Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccade851e66f202…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 06:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fba3317df059efb2d75e763858ad578 SHA-1: 3ed53faffbf95a06a0e479c52e1dd261c14c05a7 SHA-256: 3ccade851e66f20222e279b66d613bdc65c8e66eb704bb701ec0a083e4105062
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

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 http://chargooshads.com/images/upload/files/99151431683.pdf In PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/5011269258.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613402a131e6f---rasamisikamirud.pdfIn PDF document text
    • http://trieuduong.com/images/Download/kowivate.pdfIn PDF document text
    • http://z500.si/files/nupibufawana.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nanopuvu.pdfIn PDF document text
    • https://kaparatt.com/images/File/zutuzekatenazibedudodix.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/pilajuzewebomutojozak.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/85008253203.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/vimupesosogazefufejofimu.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/36662997959.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/60761657691.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/4588318848.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/zafudumebinife.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/13208807359.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa89f941e4---83636936016.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/22263913229.pdfIn PDF document text
    • http://rsst77.ru/upload/files/95848197384.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/99860977683.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/30443498561.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109220220197327.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/duvarilatazufagetafitukaz.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/mewoxekevivunijomibusax.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210925134354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=itop+vpn+mod+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_off0000ae76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 15008 bytes
SHA-256: ebe7519817699e585851aee029b5e544b1a30b8184d7e32b85e39f87eb827774
font_02_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 10256 bytes
SHA-256: 9b6a45be17a57701fd977e67c9b0bb2bdb8fdda7e6e35161ff4370670f3c62fa