Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8a6fad96220da5…

MALICIOUS

PDF

76.0 KB Created: 2021-10-11 16:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b332c6c9a84c8c4659ec87228cbeb5d SHA-1: 0a91000cc3980a53fd661d045ec26dfad9d72cc6 SHA-256: ed8a6fad96220da5682029cc3aa1d672c3274670b8cf3a04c5c6774f87c067f7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to T1059.007, and the overall nature of the PDF suggests it's delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.polni.si/Images/files/34147634567.pdf In PDF document text
    • http://transcash.com/ci/userfiles/files/pamududefudakogotuvu.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/wifufozodojugetavufof.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/78017407231.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/jenisixiwumomevuluro.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/gavuxevunimozijidagamafid.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/varibez.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/52399910664.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/jebefapezeguped.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/bodivimuwonugu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c90b79cbfc6f0abd61cb18408f94acf4/fepugojenuliza.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/79774222312.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/kuxutekuponamibejepez.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/givaso.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gigilerufawizoxem.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xelew.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/50664368755.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/kinijasapuzu.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/3482209866.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xujofute.pdfIn PDF document text
    • http://qdcmd.com/data/files/rofitixefij.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/fikewefazojiwima.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/31279189612.pdfIn macro / runtime command snippet
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161a4a9974c4---90966733415.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/powarilopilifomunok.pdfIn PDF document text
    • https://benhgout.net/uploIn macro / runtime command snippet
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=income+and+expenditure+templatePDF 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_off0000c41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10660 bytes
SHA-256: 753d99b866f93848fb7516160d18cffdcac893b20095804f4b09d4a5a5ffde72
font_02_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 17920 bytes
SHA-256: 6907f6252bce6336d56154f219951b83e44427d39ed6a4ae2ad40b3d37ec6950

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