Malicious PDF — malware analysis report

Static analysis result for SHA-256 f573b38d0b9770f5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 06:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc2e38a6eb76ae6852f2f4051467d7a3 SHA-1: 8c7293d9f5c032a471dafa7d1b6a78660cdf7ba6 SHA-256: f573b38d0b9770f584d7c4ab441a767b9640a01eabffa9822ddc38de0c9dd814
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, with many pointing to potentially untrusted domains, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.agencesramos.com/ckfinder/userfiles/files/sifuzimavezas.pdf In PDF document text
    • http://bfcy88.com/uploads/files/74229839005.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/55567022330.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/pexopovetafakifajedusuxip.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/99960617967.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bedogirifobedutilus.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kimexabokoju.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/64890171525.pdfIn PDF document text
    • http://xycrusher.com/d/files/bopodavusekanisijivazu.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/monefesafigovolovezanaziv.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/gaxuzexasudomakefadobe.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/3805335702.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/wivajegafokujelejeruvu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb5c456b0---viperevekir.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/gujafekitalikip.pdfIn PDF document text
    • https://aildf.in/userfiles/file/10132241889.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/gumafup.pdfIn PDF document text
    • http://naso10.com/userData/board/file/fapapisubumeg.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/tesixisawunojoteribugipu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/tawenurelepobexev.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/xazanolitemuxesuvexep.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/biperenukulokumetikag.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/44388296490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mvvm+with+clean+architecturePDF 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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 17448 bytes
SHA-256: 3ccd3c0033a9dcb300e178ff9400ead5ac4c6c7f234c851b13dfb72a5e3ec161
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10452 bytes
SHA-256: 9c92bf44bd2d598b9d9c944c06e7328927b55df5a7195e4f4752de07c448c3f6

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