Malicious PDF — malware analysis report

Static analysis result for SHA-256 49936c265d51c92b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-21 20:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0941a3aff362c50d2fa8aca65c0c19fa SHA-1: 705ef682132a650fb2ce093c2e90beb47524370d SHA-256: 49936c265d51c92b776af3fbe4372a74156049e2a546040245a4fc99a39f55f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing and SEO spam. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, with one pointing to 'http://riramemixezu.epizy.com/what_does_honor_my_request_mean.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/award?keyword=7+c+s+of+effective+communication+with+examples+pdf
    • https://cdn.sqhk.co/zotipimesaza/Vhcx5ih/exorcist_2021_remake.pdf
    • https://cdn.sqhk.co/konosoka/jJVNnYv/up_b._ed_scholarship_form_last_date.pdf
    • http://wovidako.22web.org/60930043597.pdf
    • http://fegalaro.iblogger.org/livros_sobre_antroposofia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://riramemixezu.epizy.com/what_does_honor_my_request_mean.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_b0ae26968b8b40869c62b6cc9e27fef0.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_c71774e55aac4e1f9a22bea607b4b97d.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_48ae4d78ca914fb49168de2919d0c9f2.pdf?index=true
    • http://lokexab.epizy.com/pdf_to_word_converter_download_for_android.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_9467425e327943dd996546a429674fff.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_d8437eaf888443bf8a7863767c7182a5.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_730f926726eb4c079a9442700f4df272.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_80453646311540cb99347be6bad778c6.pdf?index=true
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_95f9d9e6f8c54eb3b58983e2aed5f12e.pdf?index=true
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_89316ec7dc5f4a31966568188bf42651.pdf?index=true
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_881551a1e4bf4bd48c225d5ac4640b80.pdf?index=true
    • http://petikeb.rf.gd/free_missing_addends_worksheets_for_first_grade.pdf
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_f349b36ccbfb49a6bf0c5116ee00c301.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_bca41043869142afb96e2e3e25c6f379.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_56dfec366b984cdc950170f32878ac10.pdf?index=true
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_2b6a15918c8944b88d6294101846e3aa.pdf?index=true
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_4be14b76245c440a81318392b8d606b3.pdf?index=true
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_7c009f40bcb144eca5d5aff9a2588de5.pdf?index=true
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_26591db4bb30495ca7dcfac4174e417a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin
c39cd34e3905371f28c079d5a70d3dd808c8df9fcc3fb12862561067663db128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5504 bytes
font_01_sfnt_off000102bc.bin
578b62669f056307f01b576d33bfea7ea76cb87cec8cf1b02aa87448e78ddb85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 11568 bytes

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