Malicious PDF — malware analysis report

Static analysis result for SHA-256 937bf11edb71a20c…

MALICIOUS

PDF

289.9 KB Created: 2020-12-27 06:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f6f5852989da7b308f1eb153461c1ba8 SHA-1: e2e9d94b05a2540986d9949ba679c9c500507384 SHA-256: 937bf11edb71a20c53c81aa5ae6b672199d37fab001ef7684d85620ca2f253c1
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://gettraff.ru/strik?utm_term=chinese+chess+piece+values'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests a phishing or malware delivery attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=chinese+chess+piece+values In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5f8b425e002c7.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/fadipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_5fd9168e03109.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/kidinaroledevutas.pdfIn PDF document text
    • https://sipelebe.weebly.com/uploads/1/3/4/3/134312525/vovupu-mirip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fd1e71136c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5f9d863ff1573.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/kolevigotadaju.pdfIn PDF document text
    • https://rijejoxutozi.weebly.com/uploads/1/3/4/5/134599637/rademowiget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3ef7c2-0979-426b-b73a-784d579ab960/8527806165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5107440-08fb-4e65-997c-f5e50af3b05b/amana_tandem_7300_dryer_thermal_fuse_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf943cf-56bc-4a76-8666-cc955b29d458/adobe_illustrator_cc_2018_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a576b14f-8b3a-4a01-bb74-de41448ece98/2881485972.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/avast_premier_antivirus_license_file.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/cool_movies_bollywood_2018_free.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFF3 112880 bytes
SHA-256: f6a8dd7d0ac104b81dc6a9d95b1e75eacc244928958f1f8a0a07c19cf13c437e
font_01_sfnt_off00042ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42EC6 4892 bytes
SHA-256: e54581ff0975e63e5f29d013a8d6f1aec67e7e0167d564177fff54ac5139e412
font_02_sfnt_off00043f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43F62 6064 bytes
SHA-256: c2d0825e633ef619cebcea70814e8033e313b4bdf9ea0726a1852b5278a66555
font_03_sfnt_off00044eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44EEB 13700 bytes
SHA-256: f06a9ec79e8fa3c654b07630b52b06ac19f5f17d40567d60fbe27c92481d0b73

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