Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2836df74e0ac24…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 23:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b387c35f10968bc0372129b329f7085 SHA-1: d1c7b70194e8ee627b369fc2cb9b64ac754d760f SHA-256: ba2836df74e0ac240e84e7945ad923e293f633dab49182e6aba4232dd05a4a83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://andrenickels.de/ckfinder/userfiles/files/11461606027.pdf In PDF document text
    • http://89928386.com/uploads/files/202109011816286260.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/21275653506.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///pedewizojox.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/97271253070.pdfIn PDF document text
    • http://mdtrend.hu/files/file/fipigabixuzawibenewapaxuj.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/paponuwod.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/22810095274.pdfIn PDF document text
    • http://krzeptowski.pl/file/rebexubevibaxinezusezune.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/64535523477.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd47ddeb8---vazumuvonunokatokelamoxob.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/45923111892.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wokifugimejexamonakepuv.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/wisujedeniwimolunono.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tiwuneroputupujise.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/2331096084.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/10866003681.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/pawijodanekatu.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/15493926283.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2109d055ca15704011eca8181af1b27c/69633677401.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/bofizito.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wanipopalusagezaza.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/dosenuwewano.pdfIn PDF document text
    • http://acril.ru/ufiles/files/14226226451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pocket+edition+apk+minecraftPDF 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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 10660 bytes
SHA-256: 31db762af57e9d4079dbac45eed4c5385f5e5b536bd7ec0a713cd3c58a76268a
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16176 bytes
SHA-256: c64d75f115e48e0bd955a27be6a7167afa78e3ea67e1420d1c298a01ee6980a0
font_02_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1