Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a67e801c3573ca5…

MALICIOUS

PDF

85.0 KB Created: 2020-12-09 20:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f1053cc41cc6e076ec5c32bc673e046d SHA-1: 170ac80fae4f3483b74b845e07a4f41188c4f6e6 SHA-256: 4a67e801c3573ca5d489e24366d84900e2465294b79538754ad4dee26dd8a304
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://traffmen.ru/strik?utm_term=the+wave+principle+book+pdf In PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/neguwipife.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/3687958.pdfIn PDF document text
    • https://fekogekakoxoki.weebly.com/uploads/1/3/4/6/134625435/c33f1ec631.pdfIn PDF document text
    • https://labegemi.weebly.com/uploads/1/3/4/7/134709462/c53c30a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e813bbb1-3ad5-4651-9ce0-01c409bf67bf/96911714043.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe41fc3570fb44d1cf3684/1606304252779/algebra_worksheet_section_10.5_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1df7188c99b6d37ae0383/t/5fc6820b4f98375720c0d2dd/1606844941246/59556214448.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf59c63c6ccf69f355a359/1606375880435/amelia_bedelia_books_online_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc532053398ff751549e1fd/t/5fcfffe43308cf4e6fc5ae60/1607466981371/wuzizinejaxajuzefusekonuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc185bea8793968640cb600/t/5fc8403e094cf7617dba2d17/1606959169568/19335724109.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553bcab79f442f246f04a/t/5fc8b067e21c7c679ae9bb83/1606987883450/project_muse_game_pc.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 5372 bytes
SHA-256: c1908fe3f54a295701b85a8ec0f53f85aa477be45600b3edafeb50989293830b
font_01_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 10860 bytes
SHA-256: 6a3f23b9423853cb95b346c1e05d16ce12b914619f9c4b9f5fd6edf09214ee14
font_02_sfnt_off00013232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13232 16068 bytes
SHA-256: 03a5ddad4a2a9171a93ce60914583e3601ab986f29a2c4cb248efc8e19c0a50a

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