Malicious PDF — malware analysis report

Static analysis result for SHA-256 b738beaa07c31dd2…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 13:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b67d92837c98f54041f58a044d364fba SHA-1: 60814fc4b513354e5bd248a87f3a2ab34e2aa09a SHA-256: b738beaa07c31dd20ef4db92d6be1f5563e27aec13db67c352c2c174504f976a
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the PDF's purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=android+how+to+capture+screen+video PDF link annotation
    • http://centromp.it/userfiles/files/1231579527.pdfIn PDF document text
    • http://sartor.ru/upload/files/vijinovum.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/lavoxinevumelimeget.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/runoraxotakepufewa.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/71362792643.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/12570962590.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/detewatomo.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/32731312322.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/29586517910.pdfIn PDF document text
    • http://santeh.md/img/files/mumoxiben.pdfIn PDF document text
    • http://3sdent.com/upload/files/9458592948.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wukologubuvuxada.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/xegurogitaxin.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/76576276638.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/fogozuliruwo.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/18943201935.pdfIn PDF document text
    • https://emenu.hu/editor_up/79425181899.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/vulibikipezuriligatug.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/kififurapovi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/63313039540.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_off0000aaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 15500 bytes
SHA-256: d562e2e7ebbe82f48afcc482e96a7ced4bafc07268fd4c4fd5ed181594f000e1
font_02_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10800 bytes
SHA-256: 9748b5bb651de38b544d892e5699edd7bde277f8ac501165535b94ec0d0b5063

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