Malicious PDF — malware analysis report

Static analysis result for SHA-256 33765dd101986ce2…

MALICIOUS

PDF

71.7 KB Created: 2021-01-13 10:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511a5ce2db2bf563ffaea3f5f581cb0a SHA-1: 72750d77d5bc9366d47e22ad325635a3452f1a82 SHA-256: 33765dd101986ce2101788553c2335f3e57725e6c995722d3210fa542562ac4f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=1%252F8+plywood+2x4'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=1%252F8+plywood+2x4
    • https://site-1083792.mozfiles.com/files/1083792/netflix_android_tv_box_not_working.pdf
    • https://site-1172364.mozfiles.com/files/1172364/star_wars_jedi_fallen_order_2_trailer.pdf
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f89a39085663.pdf
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5ff4fea440701.pdf
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fe0cfcf37807.pdf
    • https://site-1198654.mozfiles.com/files/1198654/83691479877.pdf
    • https://site-1178774.mozfiles.com/files/1178774/steven_universe_song_lyrics_it_s_the_truth.pdf
    • https://cdn-cms.f-static.net/uploads/4497688/normal_5fc0afac84159.pdf
    • https://site-1214400.mozfiles.com/files/1214400/xonol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudufigunabi/16212359619.pdf
    • https://s3.amazonaws.com/xakapudakadu/best_alarm_ringtone_for_mobile.pdf
    • https://s3.amazonaws.com/nuruvapozixix/addition_of_polynomials_worksheet.pdf
    • https://s3.amazonaws.com/varoximu/93408738969.pdf
    • https://s3.amazonaws.com/paropabaru/scotts_mini_broadcast_spreader_owners_manual.pdf
    • https://s3.amazonaws.com/fosagoba/91956211486.pdf
    • https://s3.amazonaws.com/kikunojulejuj/individual_education_plan_template_uk.pdf
    • https://s3.amazonaws.com/dozore/multiplication_worksheets_grade_2_common_core.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba0.bin
eee612dd11049d3519a8db095d2aeafba4fca4b4758c85996f6391de666e3da1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5140 bytes
font_01_sfnt_off0000ed66.bin
b26edc9597a2017724a3b2c7eb7ac9274791759be0caf5144b004499c3347e21
pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 10772 bytes