Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ea54bc74400b3…

MALICIOUS

PDF

86.0 KB Created: 2021-10-06 21:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 016775da5666e04b587384d600552ed1 SHA-1: 1dd42a3aa2e84ffe2b3c07dabdaf3f3cad45a159 SHA-256: c91ea54bc74400b3cf4c7d943b9d93a99dcb27d41977b88218c1aff1fe56efb4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aiwcecckolkata.org/FCKeditor/file/31172909107.pdf In PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/mugejawob.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/81756003820.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/nasase.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/13830559075.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/59205839078.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/zekas.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/89360355463.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/53249212002.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/16151728039.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/56563829804.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615bb6afc3ae1---pubot.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59330587432.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/92911543518.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/rutujixot.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/siwegiwi.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/34934695301.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/16f6fc44ab3cc2d7780c2ac9db99ac62/27431537247.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/mamolopatipiwutevax.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/73896629913.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-30/20210930164613921086.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/43013768324.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/8586659782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+merge+file+into+one+pdfPDF 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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 10588 bytes
SHA-256: 4b27e0048f21547c28963af601cd4a90369b77f0cb9972c054a530262343effe
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 20160 bytes
SHA-256: f5d8222d3c5857931255a7f59320f58e3d2bf075e3f5dbdc54884d52597d7a97

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