Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a839c1f6b1fc019…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 09:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b6ee59b718154ec10fa4a9972142864 SHA-1: 494a7473a29dd19ef84df6f76fac6b2acfe2df6e SHA-256: 2a839c1f6b1fc0198655ed929f782bdbcad293413b07a70c325f914793fcfd9d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and uses a password-protected archive lure. The presence of numerous external URLs suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and malicious indicators point towards a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=portal+2+open+console PDF link annotation
    • http://erulingua.hu/uploads/content_files/files/73787983802.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdae6a0f8---kalan.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vubafeja.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pebodulimedukosuxuzavev.pdfIn PDF document text
    • https://sitarasign.ir/data/file/87794839956.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/tilejegis.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/37221095759.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/wominobunokazexifalefome.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1cbb7901---pabeniroxe.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/rafirofaxe.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/70086008796.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/27578457706.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/98277334715.pdfIn PDF document text
    • https://aitalk.vn/upload/files/dedifanazotejoxawawafibat.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210908223320.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///95319072574.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/zawodot.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/36596967774.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/fanexuzusidid.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/pixezokoxaxoxugifonojoko.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/49385601696.pdfIn PDF document text
    • 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_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10396 bytes
SHA-256: eb366e66514823b35edcdd0f898b8c15f21ae057e25b0a3e55ceb500cee54324
font_01_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 18904 bytes
SHA-256: 0331aa6a5508c65a33bd7f9de1eb18a3a7cd8cc342b4b60ba1f73f2f2525706e
font_02_sfnt_off00014c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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