Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b96abff267c0de…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 22:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2347ec23fbecdb507eaf97f5df57d0b0 SHA-1: 716b5d625b43dcc3a63256408bba2511b3dbfca5 SHA-256: 02b96abff267c0de652707d754a7b10ff8eaa791c3b0f4f6ed34019eca10f306
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=samurai+shodown+apk+free+download PDF link annotation
    • http://azizavacanze.com/userfiles/files/viwifa.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/tajurubilowujise.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/foririnatevawifarekurew.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138806cdeee5---28771973396.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/25399277598.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/bunasoposekij.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/97974200772.pdfIn PDF document text
    • http://trubaopt.ru/content/file/vetuguxetezawewaxe.pdfIn PDF document text
    • http://ymmicro.com/files/files/1767861742.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/mabitabijumamafora.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/xilegubegigowifax.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/51098801849.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/12209464887.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_100245_119.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7685e619---wiwemurutitokisoruwi.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wowuxupi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/57163802299.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/girulubofurol.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/56833235612.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/konuw.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/81484173346.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/81214357817.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/limasojonegatanewira.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_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 19124 bytes
SHA-256: 950e9ffd3d5d3bdaf1119ec36745af996746bc398d27087136c55edb44fa1f08
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 11016 bytes
SHA-256: 5c7ad0b5a92eb91ec34b6db526afb6a00473be933791dbee8318cb539865d0aa
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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