Malicious PDF — malware analysis report

Static analysis result for SHA-256 566e3c7fcf0254ee…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 11:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afe61719f2086fb05e0ad826849deb17 SHA-1: 859ee7b831f4778bb7d63b51255ab2e737c11153 SHA-256: 566e3c7fcf0254eefc1838913cf613d81fc7672b421a5e7c33237685b121e1e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external, potentially malicious sites, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this by identifying the document as a link farm on disposable hosting, likely designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=photoshop+for+pdf PDF link annotation
    • http://intersonik.eu/upload/files/wularapob.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/venepukovorekitokatav.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/52966686638.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021972249411000.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_000626.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/15449773430.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/dawefokibododonumaxov.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/zexaloji.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/vazafuvumudilerasopo.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/16064631155.pdfIn PDF document text
    • http://mosjob.ru/images/file/wikovikejab.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/lusizowilitet.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/24926897904.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/lorijunimimirukabamo.pdfIn PDF document text
    • http://imoroz.by/upload/file/faroxowefawisimatimifiv.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/34910819588.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/nigiredimudura.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac898376f8---sidikotide.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/ginobogedelej.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/73985195878.pdfIn PDF document text
    • http://bdnchem.com/upload/files/nunijowaze.pdfIn PDF document text
    • https://5udua.com/contents/files/86604720714.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb983ea288---wegasi.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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 10060 bytes
SHA-256: 2264ab29805c219f4cbdc5fc5d16ff8f9dc945ea362879014681db4bd0b0c1c5
font_01_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 17496 bytes
SHA-256: 716f8144de4a90a917638f9d47f2658088b31e4393e9204d0d0923f5b414793e
font_02_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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