Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fffa498d1e3d8af…

MALICIOUS

PDF

75.0 KB Created: 2020-12-22 15:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34fdf52f1407f144c34b0b9f6b8c8691 SHA-1: 761985a39ab7acc94e32b9664ff64626c68c14e8 SHA-256: 3fffa498d1e3d8afa4f49f87813b8ae4a7e92f2a320f4b681e0d025eae6c3efb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The embedded URL is designed to trick users into downloading potentially harmful content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://gettraff.ru/strik?utm_term=bike+unchained+2+mod+apk+3.+16.+0
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fbc29c787c60.pdf
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f889b5501255.pdf
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f87053317d96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e7ad6609fd0ee79153f2/t/5fc25a875147b148047f2d41/1606572682187/crystal_report_formula_field_if_condition.pdf
    • https://uploads.strikinglycdn.com/files/ffb39fd2-df67-42d5-a801-ed3aadb9e751/warlock_class_hall_campaign_guide.pdf
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc1101461e25426e15db438/1606488087273/object_oriented_programming_in_java_mcq_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/016718b1-9ffb-437f-878e-a232747e5450/55156132009.pdf
    • https://static1.squarespace.com/static/5fc0f8f692c50b1a1e77efcd/t/5fc1d6739ee0f32b87967105/1606538868656/wemorofikibudav.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0699173fb5383b68d63f/1606289049811/cra-z-knitz_ultimate_designer_knitting_station.pdf
    • https://static1.squarespace.com/static/5fce08b1bb7ea8683c95c538/t/5fd0e1c03364176a126826ce/1607524801762/zikurunuvidadinoze.pdf
    • https://static1.squarespace.com/static/5fc36eab6609fd0ee7a18a99/t/5fcea5f1e4d8f2662cf7cbdd/1607378417950/george_strait_troubadour_album_songs.pdf
    • https://uploads.strikinglycdn.com/files/068f7b8d-8d2f-4793-8ed7-4f2b6deca63f/20467098428.pdf
    • https://s3.amazonaws.com/bejideba/nivofutoze.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca1.bin
ee8dddd47b17ab3bc5f0bb701b23165ffc70fcc0eccacad8bfd829b3cb728ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 5796 bytes
font_01_sfnt_off0000e047.bin
93f2696c148b5b446c32c82a4f1d1d99ee2afac32e75681509ede00c16e644b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 10928 bytes
font_02_sfnt_off00010604.bin
94636c527c9a9460b612276b19c69e22216371381968b420d51dada1e806b1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 17160 bytes

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