Malicious PDF — malware analysis report

Static analysis result for SHA-256 e654fa4cefc968d3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 04:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d597dbbcd96160405fae366959754b6e SHA-1: 3a02ce611455c5846820632b530192b03f04ab81 SHA-256: e654fa4cefc968d3608d4bedcf9d2e3d0631018d7a167210b04118520df38908
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=react+native+switch+android PDF link annotation
    • http://wxeina.com/userfiles/files/pigokuvupa.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/10694858699.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/36397003944.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wagalisivopifolufifokixi.pdfIn PDF document text
    • http://abworder.com/uploads/files/51124388405.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210916114923682.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/39663933401.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/65181975786.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/rinolotidujid.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140607f45ad5---3420946156.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/3892367520.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/rigupabegepuvazi.pdfIn PDF document text
    • https://tadimtursu.com/image/files/73563211449.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/d5vajtt3icmhgbs7ou4p5u7031/matisukavesozutojaporaf.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/91646885535.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/27303951648.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/32407002651.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/21256859533.pdfIn PDF document text
    • http://salwex.hu/file/27165034639.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210918101739.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/wupoz.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/tirale.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/70391734558.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/43708494452.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/mifowexuborodorubiv.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_off0000afe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 10620 bytes
SHA-256: d80343f02086ef8d2ceb47497e353ffaee9787ed03b49c41ee1746ef16e18626
font_02_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 15884 bytes
SHA-256: 126dc42f056c8be59a18d456b39e388b8532a6732b8c1890d62f5e76b47c6937

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