Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2e6c5506c8c269…

MALICIOUS

PDF

83.4 KB Created: 2021-05-02 21:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ab5a8d1f54702900db0905dcb627557 SHA-1: 97520f6e2c011452635f621cee9cca499eab1829 SHA-256: ca2e6c5506c8c26960e33cc812e2568fe412ee614419323d54122ce86e5cd6a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm heuristic suggest the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dafemum.ru/strik?utm_term=christmas+carol+songs+list+in+tamil
    • https://cdn.sqhk.co/zebusukef/QhfWghc/bizevadufu.pdf
    • https://cdn.sqhk.co/desiruzag/jhWjdrs/furious_road_dana_brighton.pdf
    • https://cdn.sqhk.co/juzogimuju/hnzQgio/grace_crowd_townsville.pdf
    • http://xujavimok.22web.org/what_is_standard_enthalpy_of_atomisation.pdf
    • https://cdn.sqhk.co/xedaberetaj/dUjdhiY/wokagomajuma.pdf
    • https://cdn.sqhk.co/kapimetavis/gXxjbge/pixubupo.pdf
    • https://cdn.sqhk.co/ditutafewaw/Bgcrghd/61956628038.pdf
    • https://cdn.sqhk.co/derubejes/hiDzrsS/tonif.pdf
    • http://patutejugivipi.iblogger.org/abul_kalam_azad_books.pdf
    • https://cdn.sqhk.co/bemaxopig/Z2idjat/bugsy_malone_soundtrack_vinyl.pdf
    • https://cdn.sqhk.co/daxegajok/XieKmic/kujubita.pdf
    • http://medicalpracticementor.com/patent_search_analysis_report_psar_11j2n6.pdf
    • http://daliadiago.com/jofimaralatajeposr1afw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_b8315dd9ae9040988171dfc3aa4014f2.pdf?index=true
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_aea4552f6a764c5daf39b17fe911805e.pdf?index=true
    • http://jazikok.epizy.com/24886178567.pdf
    • http://mojofukiw.epizy.com/column_chart_google_spreadsheet.pdf
    • http://juvudujaxajiji.epizy.com/2016_answer_key_prelims.pdf
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_88baaea79e96449694d61e018457b0d6.pdf?index=true
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_72076f93ccfd447ebd2f0e2f9e9cde20.pdf?index=true
    • 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_off0000f4f6.bin
0c8706a64eeec2824f01cd830fc4291dde456ec43ec52f5276379e81876f68bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 5116 bytes
font_01_sfnt_off00010629.bin
d6b545d2a098ed95d9dddbd36931b18770faee581a98b5379901536480233cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 10832 bytes
font_02_sfnt_off00012b10.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16312 bytes

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