Malicious PDF — malware analysis report

Static analysis result for SHA-256 e926e13d50468bfc…

MALICIOUS

PDF

67.8 KB Created: 2020-12-09 20:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3148539daf090ab4f0acd15d47d630 SHA-1: 1ba6795543e733e23151e17d837ad76733ba7fc5 SHA-256: e926e13d50468bfcfe57c5dbe8cab0ed4dfa27a46ac0cc20e1263b9f2c2a3867
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojanized document. The presence of numerous external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/aws?utm_term=acronis+true+image+bootable+iso
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5f8e11513b469.pdf
    • https://jusegopij.weebly.com/uploads/1/3/4/4/134480833/derekomuxa-nadib-kufudonurov.pdf
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/5076781.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b05c955c-b5a1-41fa-95ea-a2e741fbc255/minecraft_1.8_9_seeds_survival_island.pdf
    • https://static1.squarespace.com/static/5fc53b031c8c7413144e61dc/t/5fcea22e1f1c3930cc1745f7/1607377456914/rojogorobovu.pdf
    • https://uploads.strikinglycdn.com/files/45ec051e-fdd1-4169-a18b-448e329e56db/osmosis_practice_problems_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/8a218186-cc14-4c00-bd69-565a06b31d88/sixabikubopusinavavule.pdf
    • https://uploads.strikinglycdn.com/files/e5be46fb-00b5-4fb2-9302-996ff056d16d/daredevil_season_1_episode_7_download.pdf
    • https://uploads.strikinglycdn.com/files/f4129b1c-8f97-40f8-9e80-40920637909a/anatomy_and_physiology_2_study_guide.pdf
    • https://static1.squarespace.com/static/5fc5145da3bf4b14abc40464/t/5fd01c852f29925fbb42ebd7/1607474311140/roman_adventures_britons_season_1_caches_level_13.pdf
    • https://uploads.strikinglycdn.com/files/4485e32b-77e6-45e9-8019-94438c6f362b/unblocked_games_corner_tank_trouble.pdf
    • https://uploads.strikinglycdn.com/files/92425190-1180-4910-8862-cbadc9d626d6/lefamejelof.pdf
    • https://uploads.strikinglycdn.com/files/67fa884a-4d3d-461f-8f83-5585c481e203/university_of_wisconsin_law_school_dean.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_off0000cb42.bin
994b6c90a4ad289b4adf1918a696b478d4687aadb447eb6833b72eea09095dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 5248 bytes
font_01_sfnt_off0000dd03.bin
e90559b09b7ee5481d3d5adf5453a6e9a948367799b751d0996693cb898c1ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 11272 bytes

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