Malicious PDF — malware analysis report

Static analysis result for SHA-256 517bf348e9f1ed1e…

MALICIOUS

PDF

75.0 KB Created: 2021-02-11 01:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4fcfbb708b5c46d06f29707cdfc8d1e0 SHA-1: 54f385bbabcd061eb92e410b565ad487980358c8 SHA-256: 517bf348e9f1ed1e45d8cc0e704348135fe3f67c7f2e66bbfae0de856549db4e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=law+and+order+sound+button+app'. Additionally, a high-severity heuristic indicates a 'Browser extension / update installation lure', suggesting social engineering to trick the user. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the combination of a malicious URL and a social engineering lure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=law+and+order+sound+button+app In PDF document text
    • http://buviturowugigew.66ghz.com/61999486753.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/h9aJPpR/hello_dolly_characters.pdfIn PDF document text
    • http://bifakibebus.iblogger.org/25981019249.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/B3Xtiah/the_cult_of_chucky_full_movie_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/8LhcEnS/31289909763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tezude/ajaran_syiah_di_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/34364802734.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/java_core_dump_analyzer_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/xorowedadagonozu.pdfIn PDF document text
    • http://nalejunubotuw.rf.gd/48443523701.pdfIn PDF document text
    • http://fokibuzevurir.rf.gd/pikesesewasile.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/hacksaw_ridge_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/wutuxar.pdfIn PDF document text
    • http://bikumomobopo.rf.gd/red_bus_ticket_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/directv_channel_guide_kansas_city.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/82343150588.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/puxufuninojeretumimemu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5092 bytes
SHA-256: 9e9eaab632bbc1529679b69ac91a95d08efffcd0b25f22415d4fe9577abd355e
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10992 bytes
SHA-256: b5ae98d90d25dd4fdcea60b38347d8ec998f074ce384c43c98b7cb4d1a6cb958

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