Malicious PDF — malware analysis report

Static analysis result for SHA-256 357269b7e041ea35…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b14775548cc13bf5992dce08748ee73 SHA-1: c533ee34fb889d47e8da4d87d4603eb47da62416 SHA-256: 357269b7e041ea3528804f871d5944d5d87c0550219edb54b543d160cfcc5d87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection scheme. The presence of embedded URLs and the overall structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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+do+i+turn+off+silent+notifications+on+android PDF link annotation
    • http://esipro.lu/userfiles/file/bosaze.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/zarunubavit.pdfIn PDF document text
    • http://elsped.hu/files/file/35515583901.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/renigitokodexo.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911095354997296.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/lijemumirogowawozabok.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/litowonenumatavi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ehq7pc7p7u0nn436aavbu8sm6c/bomeragi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/89775366034.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/vukune.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/99302268332.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/13346770634.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/86887459641.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/fubafuvasu.pdfIn PDF document text
    • https://toocapen.com/files/2523943426.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/9588764235.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/mejinowapumipavekobaxu.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/xorij.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/telelu.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/42274470939.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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10644 bytes
SHA-256: 4e51fcd4258c1bca9d4451768915c069dd7e810ee5edb1ee986c75bde2b15e55
font_02_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 18452 bytes
SHA-256: 5fe76df32ba96d2ef671f41228cb12c7dbb63f0b1b04b92b1cdb56a092ea2b22

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