Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61032e4640d2956…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 19:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cf7964f69ee56cea0ee8d0d1e8a7a7b SHA-1: d02c35648f5ec2d348eba626d29b5aab1dfc358d SHA-256: a61032e4640d295644c883dccbe44e70aa9201486119883f4ac1b7cc67a927d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the link farm nature of the document, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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=minecraft+house+ideas+easy+small PDF link annotation
    • https://raiporjai.com/piceditor/file/47438708943.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/78567430097.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/93784291057.pdfIn PDF document text
    • http://seamacros.com/upload/file/fevovanegege.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/solopexujurojaposoma.pdfIn PDF document text
    • http://ossokahve.com/upload/file/jukewo.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/82458658485.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/44106832270.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57618644785.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/3358837552.pdfIn PDF document text
    • http://telecycling.org/files/file/33765663367.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/fevujisoserusajomari.pdfIn PDF document text
    • http://pnalog.ru/images/file/segitibateno.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90649e72f---482781621.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/42184910816.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/tegulegaxilabologudukezo.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/16319512020.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/dexewevirefeg.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/67151458726.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/48108855332.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1e7fc26502ca493e1cbfdd3b90d73776/1682731555.pdfIn PDF document text
    • http://dd-eng.com/files/files/mekejaruma.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 17028 bytes
SHA-256: 7001a1d2839606a122801ec7abae81b64b6e513ea7087f6616de430baca0af2f
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 10948 bytes
SHA-256: 152a2b3b0e0f1326fb8354ab00a544b4f3dd195ca563988a697ee00f4c77e19d

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