Malicious PDF — malware analysis report

Static analysis result for SHA-256 58762a030c8f2509…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 11:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 458fa9bacc1f978a85ae530f6b6a03b6 SHA-1: 38d929b54d7071848f0f3d43606e7a04ec4577e3 SHA-256: 58762a030c8f250974f7b6bd388c8fd8540f1f221497244c0f50b0be5dcefaaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa669b7128---10945939880.pdf In PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/zurexotawigajorasajalil.pdfIn PDF document text
    • http://darstin.com/userfiles/files/82815502514.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/92799833374.pdfIn PDF document text
    • http://saktigroup.in/uploads/81561313614.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/kinijigujuroralevepufop.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/pibozevif.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/pozijuvamemitefojebowonad.pdfIn PDF document text
    • http://berbun.com/user_img/file/68723475549.pdfIn PDF document text
    • http://livestocktool.com/d/files/zuzurafuwof.pdfIn PDF document text
    • http://wenxuezj.com/images/File/25041597899.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/76620002108.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/72025765669.pdfIn PDF document text
    • http://xhzhengli.com/upload/dikifetegozamo.pdfIn PDF document text
    • https://parc-hotel.info/file/kamede.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/16121166179.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xawixik.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/newov.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/nudobag.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/safejeruwidixaxaf.pdfIn PDF document text
    • http://huefpdf.org/upload/file/17732528663.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/wuxefemokakugoxoboral.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109152314098122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=modal+verbs+grammar+pdfPDF 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_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 18112 bytes
SHA-256: f7581e5b9f062c8b2083e9523684363b49f57a7faf2ac92c4a20a1634aacbc0b
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 10748 bytes
SHA-256: 94567c08d60ff0bbfe602fbe9c70406b1307dd4f7969dd9b84780c0f1be159fa

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