Malicious PDF — malware analysis report

Static analysis result for SHA-256 867bda45e6a55fc5…

MALICIOUS

PDF

84.6 KB Created: 2021-02-08 16:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cad49c8ba93e83fa3b5abb9c079ee8e6 SHA-1: 30d722d7b07652ff74c65ac401b0ff11bf24cb07 SHA-256: 867bda45e6a55fc50bad39eb452693356748212f8af02314a82d65b4a432bc30
192 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text fragments related to 'vault guide consulting firm rankings', suggesting a lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely intended for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9172

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/aws?utm_term=vault+guide+consulting+firm+rankings In PDF document text
    • https://cdn.sqhk.co/febowozefu/jjgc1ib/microsoft_365_admin_app_store.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/fender_blues_jr_schematic0ruye.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/nufidibodudulad/texas_commercial_motor_vehicle_drivers_handbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/tasori.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/vmware_32_bit_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/sedujubegekemeduvo.pdfIn PDF document text
    • http://piwefijegiv.epizy.com/tv_guide_listings_appleton_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/happy_birthday_piano_music.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/antony_gormley_sculptures_formby.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/chessbase_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/finofurugij.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 5372 bytes
SHA-256: 70135529c6f86ea7dafc345abe2dfc1b8b357315626bfed2e27b173285d58654