Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bf3abc02646df1…

MALICIOUS

PDF

96.5 KB Created: 2021-09-12 08:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcdc562248fce511f6a42e20b5f0b5ac SHA-1: adfe203813470af1ed61326c918ed2cb94db41c9 SHA-256: 37bf3abc02646df10d9742c8388d29f8133c02eeb7b6726e2f002273309b1c26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous external URIs, including one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of JavaScript and external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=cromwell+victor+hugo+pdf PDF link annotation
    • http://celesteandtorsten.wedding/images/file/98286701696.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12440359442.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/22192363922.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/46899499792.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/74674238166.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/48751433085.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xinivizew.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/lowuziporomujokaxer.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bolasapo.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/rixevasutabuja.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/64900798916.pdfIn PDF document text
    • http://redactron.com/userfiles/file/gosiki.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/vevasapenawo.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/34421415399.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/rotuvaxopekavanejanul.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/25044210953.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/fanovanoxedagigejix.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9a234105---69854704458.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_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 20104 bytes
SHA-256: 79fb8d1d47074fd9ced480882253388da2ebde81305aa55f54f1041f85d62ac7
font_01_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6B 10916 bytes
SHA-256: be10dfbdebf902846f7e9faafa350d1012d595174605d959b25f53caf517b176

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