Malicious PDF — malware analysis report

Static analysis result for SHA-256 f843590540be7809…

MALICIOUS

PDF

86.6 KB Created: 2021-10-18 20:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ecc80dbc31bdf563fc396f418f39127 SHA-1: d616adc83e6e7ff0bbda319302baa66f9493fe86 SHA-256: f843590540be78096a77d131784ca6bb21565bb9b3341d97d04f7ed54749a6f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF's structure as a link farm on disposable hosting, often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=green+house+gases+pdf PDF link annotation
    • https://www.xyoaa.org/sites/default/files/files/pubuniwexunapa.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/razoxenonu.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/losanavupukulakobav.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/movodorupadeku.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/20062705177.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/gitivularatijejakavotor.pdfIn PDF document text
    • https://zhansq.cn/upload/file/37927342622.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/mixoxowa.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/26272296072.pdfIn PDF document text
    • http://kite-surf.sk/files/vikivubefad.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/67230088636.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/pinifiladekawolojuvofuz.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/20371425085.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202110060247324323.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/nowatepiwofavijiwewemab.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/lazalot.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wiwimitajariw.pdfIn PDF document text
    • http://greenld.com/userfiles/25204295295.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/xipozagujogopikinoketavo.pdfIn PDF document text
    • http://usagimatur.com/files/others/43306828687.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/47808387489.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///14342039184.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_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10680 bytes
SHA-256: 58433deb9ad039b708123882cf8708dfce0405cfef0b93e4a4b1f7ccefec7a05
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 19492 bytes
SHA-256: c4c9f1f771800bd295d87f0569a1a7b02c8ec08bd1799a85b1bcae82881af3c2
font_02_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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