Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cbfe646d35222a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 13:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cd8102e3fc9d0c00a093b530e7c832c SHA-1: 77abd1b1ea28b0fb364ec1ff76ba47b32a0c824c SHA-256: d6cbfe646d35222aa7b8a43c52f8a9cb774ecdd32aff06ad6b08b2c98317b65f
154 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, many of which are part of a link farm hosted on disposable domains or raw IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=demon+slayer+movie+free+online+watch PDF link annotation
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/vemufo.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/46865005529.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/minegekemumusizajusezoker.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26223337551.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/45962888162.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/rifitav.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/tataginewimosobevevavepit.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/47562000090.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/9168287388.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d98cdf6aa---zevonodigageral.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a8468d60a---vemavetigugaroxeguti.pdfIn PDF document text
    • https://masukpt1.com/contents/files/molofirusipirujige.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/xulosufakawadarunikamiziv.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141d56f09230---75701518282.pdfPDF link annotation
    • https://harley.dataroom.tw/upload/files/potofudaxuni.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/29626939357.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/tinekawejeburov.pdfIn PDF document text
    • https://kildevangen.dk/files/86612152032.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dageromavo.pdfIn PDF document text
    • http://speckrepej.com/upload/file/96155173283.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/vovuketudiruxaj.pdfIn PDF document text
    • https://edusfera.pl/upload/file/29822055847.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210908233007.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_off0000bf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF12 10868 bytes
SHA-256: 535cc6937178aca1a135e8af3368d0f211d0cf2b99ca34cf61089cec5b2f22f3
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 18504 bytes
SHA-256: 5346129813dec5a0cf11ed7a59593e89ea76ae13d1ab00b3a0bd18886b4366fe