Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c63840e16e1f85d…

MALICIOUS

PDF

80.3 KB Created: 2021-10-06 23:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c1a3c45395fca3597df9f671e7c69cc SHA-1: 86f53124b445e7f6f0d0efc4eba057e10d8a0233 SHA-256: 0c63840e16e1f85d086ff02c0bb5299be5f86bd4bc88c542fbb43c1f9d7b9aef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://an-ocn.ru/ckfinder/userfiles/files/feguwujabeboborosokatis.pdf In PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sexafixegopoje.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/74749922657.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/1906067172.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/valajoritazapopili.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4fbcrpok7itebbonig3j059hd6/sanomumaledurozakivag.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/72515032904.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojewikubidabusen.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/99776887687.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/71185873205.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/66488535691.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/nanixegobureforazosajegu.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/61453125566.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/43323488361.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/wimeminuzajasanavunupax.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37867578793.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/56129593519.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/varakewudutig.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/21800264163.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/rubimuxeduzumize.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/19776291362.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/75657249285.pdfIn PDF document text
    • https://tessuno.com/upload/files/613ad81310a2d.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nerite+snails+with+bettaPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 17312 bytes
SHA-256: b908460e9873d82cca024a3d78c3c91225a20fcaa4866e38341537f400b52c93
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10288 bytes
SHA-256: 83fd5fd89aab353e650af3772ad9425bb3928aa1170dec0d5ba860e57088e593
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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