Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccb43f3c42147bd…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 02:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e976819bc42c4f105d77e4fa87994b3 SHA-1: a4e9b0ee38528ad6e2b4c86ee0e82511bd5415c5 SHA-256: 6ccb43f3c42147bd4c684f4753afba341f9af1217f80b7e15b9b7e333e307dd9
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=street+fighter+iv+android+download PDF link annotation
    • http://panel2conso.com/userfiles/file/35695909649.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/kojes.pdfIn PDF document text
    • http://grimastone.ru/files/73970270684.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7653378338.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/732253986.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/67dd5fc6d049bd61b77b293c6b89082d/ragasomijesim.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/jutexinurut.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/razumogozikasazubedisikot.pdfIn PDF document text
    • http://holzbau-napetschnig.at/31970677174.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/71534188472.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/nazebobexase.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/39798794572.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/faxakupekuwuxujoto.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/bitoz.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/mizedejeto.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/23106589827.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zafolitamizino.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613396db72eac---33359405314.pdfIn PDF document text
    • https://betsin.org/userfiles/files/89627887321.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/janubudilekutalezojelijeb.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/zogorerafisesanapader.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/sigimegereze.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_off0000c211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 15740 bytes
SHA-256: 44d9ec035988ce234f2cd8f2957d9725e29992e03ed52c449182af3c5f659710
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10692 bytes
SHA-256: 1db8dae5e7174285337e6c360b91ed4ad71e97502631713882ace8b1d188b81f
font_02_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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