Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbac4c13c705f69…

MALICIOUS

PDF

75.6 KB Created: 2021-02-26 00:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8c1293ea1e42448f3ec6a0d753ee9ab9 SHA-1: 60adf484f326dadf6b5254e7b6e6a23bc5521808 SHA-256: ffbac4c13c705f698a659c81404e2308d8abf1fa581b17bba0613b0d619417e9
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to the linked content, suggesting a lure to a phishing or malware distribution site.

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.
  • 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.
  • 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://crophysi.ru/award?keyword=what+is+complex+trauma+in+mental+health In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_602ff9f305654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6030a1e44fb33.pdfIn PDF document text
    • http://rusakova.space/283580671xqka0.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/bgc1as0/74104028478.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/how_to_replace_water_filter_in_ge_fridge_mwf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_5ff56dcbee7a7.pdfIn PDF document text
    • http://thailandlove.site/pathfinder_kingmaker_companion_quest_rewards1xszr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392462/normal_600405e6da1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6021f18ecbf98.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/h3qRgjG/marsha_blackburn_email.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_6003f2387bd8d.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/oedipus_rex_full_text_in_urdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5ff491dc0d7b6.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/guviw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6009e77af0654.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/iidjijh/turbo_driving_racing_3d_mod_apk_free_download.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/mamibis/attendance_allowance_form_to_fill_in_online.pdfIn PDF document text
    • http://livirava.atwebpages.com/just_do_your_best_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/tefozitibitemopatuxi.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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 5252 bytes
SHA-256: 6533789b3b62f0bec73acad44fcdf59c9263031f5cebec8f548ac081525865fb
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10180 bytes
SHA-256: fa48fc3d1e2b441f8a8bd728573722b6c4b026e04d28668a19456f2e334bdbe2

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