Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5feabb5b09ea23…

MALICIOUS

PDF

91.5 KB Created: 2021-01-14 18:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fe875e32f0bf505c98ae2801a2d9e0bf SHA-1: 829ce484cbc9d1053328b6c9109fa181d04fa4c0 SHA-256: 2c5feabb5b09ea23f35bf1ff67c36a20b5c515f7de42bf23c2236281c013f856
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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=ofusho+wireless+earbuds+amazon'. This URL is associated with phishing and malware distribution. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to 'Ofusho wireless earbuds amazon', suggesting a lure for a fake shopping deal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=ofusho+wireless+earbuds+amazon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fc04aec4518b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fb79dd4b0578.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/V0ggNhf/govijevazaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_5fb73c59c5f8f.pdfIn PDF document text
    • https://site-1178035.mozfiles.com/files/1178035/all_in_one_social_media_app_android_apk.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/mokixetat/duturefivorale.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/brain_teasers_with_answers_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/hyperbilirubinemia_phototherapy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/62369708849.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/33019874185.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 5456 bytes
SHA-256: bfd691ce933ac948d72012afee26769c7441f79ab68bbcee69aea20661c34fcb
font_02_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 11740 bytes
SHA-256: 14d46210bc961f2701d17034933c1ad592d3993afaf1eda3734cd69453ed3d7b

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