Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfde4808298df3f…

MALICIOUS

PDF

79.8 KB Created: 2021-04-02 01:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3970f7fd814de31baab25616604c10ea SHA-1: 7e4ef5d6323b978364921478540aff3bcf5580b0 SHA-256: 7dfde4808298df3f06e0827ff9903271777fbdd12b6a227d8bfaa1ba80960e5f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, characteristic of a link farm, and a heuristic explicitly flags it as a 'Browser extension / update installation lure'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to malicious sites, likely to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/award?keyword=web+page+to+pdf+online+converter+free
    • https://cdn-cms.f-static.net/uploads/4393639/normal_6055fd8d78209.pdf
    • http://gazzsheff.xyz/roberakir5.pdf
    • http://uscarinsurance.info/silaneohsw9.pdf
    • https://cdn-cms.f-static.net/uploads/4487663/normal_603087ae8e592.pdf
    • http://detozube.scienceontheweb.net/favenixojerovadago.pdf
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/7830951.pdf
    • https://gaxipisida.weebly.com/uploads/1/3/4/2/134267022/8030762.pdf
    • https://lowunipuso.weebly.com/uploads/1/3/1/4/131453219/4803726.pdf
    • https://vaxunupix.weebly.com/uploads/1/3/0/7/130775436/wozabipuseze_xopuruxifo.pdf
    • https://cdn-cms.f-static.net/uploads/4446158/normal_6011b87264ff5.pdf
    • https://cdn-cms.f-static.net/uploads/4450883/normal_60384737bfb5b.pdf
    • http://opensol.xyz/87546462056xfdpk.pdf
    • http://winoorama.website/tennant_t16_error_codesecuck.pdf
    • http://m-laskin.ru/43067667642bl1p1.pdf
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/a84a8a.pdf
    • http://dujojiwasemob.mywebcommunity.org/rudila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_86b2b0063346444e955a03e3f31dbf4d.pdf?index=true
    • https://s3.amazonaws.com/gofilafixu/ahsan_ul_hidaya_urdu_free.pdf
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_1f3f4cd88d934597a5ddb12057dfc893.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_eb03e18f5b614f74987526d6aeeeac3e.pdf?index=true
    • https://s3.amazonaws.com/muxegeza/dogijigisubufowobigo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10a.bin
2e2d2799863cd2c6a15a427e9928071cede519602b05c2dc0c78c611ae5e8a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 5360 bytes
font_01_sfnt_off0000f368.bin
d62cba7027bcf445448a8861907fcb460494db163b4cd6014ef8fe7a33262fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10968 bytes
font_02_sfnt_off00011903.bin
c10fbac40c54f7f934ad2e7f5da4554758f5519c515f14c8894cf576cd527108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16748 bytes

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