Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc5dabe999d53bd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 11:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bd0357ed1baa385418256d70bad2061 SHA-1: a3d1a75b07a2b7dfb7f46143445fc2ea159e71a4 SHA-256: 6bc5dabe999d53bd3d9a0ab0d3624ce0b95c19296382083806267bd855fd25e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to use disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=how+to+draw+a+human+heart PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wolugujivumot.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/73028592058.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2n474jfj9e55de1g328ej3qj92/dilugatusepij.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/14843971640.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912060722.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/61819663053.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/83391895272.pdfIn PDF document text
    • https://carlojans.com/cms/file/8579286452.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/59744830839.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/13765968325.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/fuguludefa.pdfIn PDF document text
    • http://glassick.com/userfiles/file/pinuzefuzarox.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/goxukujodexalujew.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/5470949475.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/puluwotobagunifot.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tusekagizafudav.pdfIn PDF document text
    • https://mbbs.hr/files/55296428353.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109131951082163.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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 17440 bytes
SHA-256: 55de69bcf8454849909bf37309dfb1d4ec40e93768868a642c9255093250752a
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10384 bytes
SHA-256: 1eb36dd3e89be8c09127c9ac514dfbb721627683352519a6809bdde42d058f92
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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