Malicious PDF — malware analysis report

Static analysis result for SHA-256 98522e95627a22b4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 01:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 213f10a53e0f29b0bba8f8a0d7dc26c8 SHA-1: 71df444c24b5d3bb968014a4a95cfd4ca73bcc7b SHA-256: 98522e95627a22b4caafa275356d911efe2a8ab92a83faff6b08090718324679
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://preprodpcb.com/userfiles/files/gitovevivevefijoti.pdf In PDF document text
    • http://fabtur.ru/upload/files/gutopaboz.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/vaxopuvarus.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/ginapatazukabigem.pdfIn PDF document text
    • http://giga.sk/storage/file/9535956203.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/60872889769.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/vaxezu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/71185465650.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/77342214195.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091514021473499.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/96407169697.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nagotomenusako.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/85426238564.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/89557482444.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/widilekitufog.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/20474579795.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/96117207615.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/gixaget.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/97798217367.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gobokugelibibusesapari.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614031756325c---31531460293.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/40498129386.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/mexuja.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/waduxetizefufowerogoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+hd+video+download+guidePDF 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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 17376 bytes
SHA-256: d5dec6405c51864ec2a47babb76a9ad4401521fdef71fab099f46c6f8ff8154e
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 10648 bytes
SHA-256: 7403f0fc59e7125c17be44cd985146daf29d856ff1c017885be5956fd07cb4d5

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