Malicious PDF — malware analysis report

Static analysis result for SHA-256 548dd28812a6a761…

MALICIOUS

PDF

73.8 KB Created: 2021-02-23 15:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 960f37524ca7fc3b61d088b0b73a1731 SHA-1: e166f95c1c71ab1f397213f1a76b54501a618bda SHA-256: 548dd28812a6a761df65a5f0e5c36cf28a419dea1a2cfdfc8b113947066c2195
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link to a known malicious redirector, yafferge.ru. This indicates an attempt to deliver a malicious payload or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=descriptive+writing+prompts+with+pictures In PDF document text
    • https://cdn.sqhk.co/wijelukifap/Pii8jcN/spinning_two_fidget_spinners_at_3am.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/4Uxsirr/16628518084.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/6jiazhd/dapolesupopizosi.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/ggrahiM/raregaxubax.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/3hfPYID/66951906464.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/i3HBshg/this_is_the_police_homicide_investigation_sand.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/kHcjj6B/chinese_kung_fu_master_film.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/fhjhiia/26965211095.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/dvjgphd/sharks_3d_live_wallpaper_and_screensavers.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hgsoIwm/63799913444.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zelejiv.epizy.com/some_any_much_many_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/bahubali_3_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/87255381997.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/jabafasosewagikositofe.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/chirunavvutho_movie_video_songs.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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 5256 bytes
SHA-256: a84f135a9e56d0c985c36d92e80522754ce383858ea73b8502a5917aa8f3ceb6
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 12108 bytes
SHA-256: 65253574d0155923d80de99808b5ac9d999989bef2e5928f7f6714f25a081fb9

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