Malicious PDF — malware analysis report

Static analysis result for SHA-256 768fef5d42006201…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 04:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fa14d985ec796414c380364c6b6f8fb SHA-1: 6c2f28405d89be9e63a3e045e143f0969597fd11 SHA-256: 768fef5d420062018f7a1865fe688b61fd77d09339c52398d50b3f2eda9e4d56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=hack+magic+chess+mobile+legends PDF link annotation
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385cd81e92e---zurite.pdfIn PDF document text
    • http://josquin-capella.de/download/84091057649.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/pufejatibiduxiti.pdfIn PDF document text
    • http://workontext.ru/media/file/2779607281.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/2153884590.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/naferifova.pdfIn PDF document text
    • http://apart1day.ru/file/bopuzanodano.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/kuwefinojisese.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/58952405672.pdfIn PDF document text
    • http://sung1.com/upload/files/fiteniraluzep.pdfIn PDF document text
    • https://etadelloro.it/images/file/98469901195.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/digigafokufulamizuket.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/14729841793.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/tapez.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/10322502591.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a175b9f9ef---xiborikigujapog.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/duranejakibusonelatanude.pdfIn PDF document text
    • http://chongros.com/userData/board/file/vinatisake.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/sijevuronil.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/luzobegubo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/3646010191.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/lopovinuxukubodonup.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_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 17224 bytes
SHA-256: 30cbc416501802294020acf81f00fca915082ab8d19972453893e1d1b4ee4557
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 10840 bytes
SHA-256: f1345c216d2cec166912a0327898b570e1730230a4924fe353e97800be3ed991

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