Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e76bd35c28b233…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 20:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee7f880b3569705439a923264c49ca10 SHA-1: 55ac8d5f5d473915c5e3e7a0efc0d32a27120162 SHA-256: 84e76bd35c28b233358f4313e2c6f5d09c78eb763c0c9ea44d8b7873b8fbd50b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://manuscripthandler.com/userfiles/file/66556713353.pdf In PDF document text
    • http://henca.com/files/details/file/nonenogapafoxawag.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7dvukroh6sbt47bopir2t8pdj0/74323205721.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/rinobuxarutuzilefuno.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/wuzukowebemipatipafiraxux.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/29551237917.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ab0e899f---nunozurofejum.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/tutipojumigujizazuvameb.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/fanovanoxedagigejix.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/31173651714.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/93299130576.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/wirafomegetajudo.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/murawegewev.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/mojafopa.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/bozaf.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/38506857153.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/19157876538.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210918_D7E56F335E5D7986.pdfIn PDF document text
    • http://reylab.com/userfiles/file/52470945238.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/6651730764.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/filobepevimope.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/57640883450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=location+of+tonsils+and+adenoidsPDF 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_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 16216 bytes
SHA-256: 04e9ff88ad4f1a4e9adfc61ec3a8ecab83a84fd1a8e7527d3dc79fac9201e8c8
font_02_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10328 bytes
SHA-256: 439f9dc42e24cffecce9d72eac8ab45ba3240eeecc2d914f530b003a0453df60

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