Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b2a220de6d7b2d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 07:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b875b47a3a44b2624dbac9946e8f510f SHA-1: 1c58b13d026e917f42f05ee1c06c9df3d23df806 SHA-256: 63b2a220de6d7b2d1956dc8ff076ad72347f8de4a57435cd3e9a5f5501c05d0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term' parameter in one URL, specifically 'ps5+free+gta+5', indicates a lure to attract users with promises of free gaming content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://rnralpha.cz/res/file/52277868211.pdf In PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/gutuguzofesuneratemag.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/66977716239.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/fejulojagubuto.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vinorebefep.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/63570853466.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/1472405848.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/92906121859.pdfIn PDF document text
    • http://indel.sk/userfiles/file/34561123221.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/gatisipojituludere.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/93096803679.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/tozubaxuj.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/vobofusabogubinovat.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/97556312034.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/50099917680.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/12673365877.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/wuxolenopo.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/29991580565.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/tonebasat.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/kisafazen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ps5+free+gta+5PDF 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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 18968 bytes
SHA-256: fddd72a11f88060ccc688f4bb8ca4bdc9d6f56d6f4be38badcf30d211d708e8f
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 10160 bytes
SHA-256: ab4499b964f6f86054078c93db95f283ce80c0377833d97e033758f16d71abec

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