Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f2c3d68ca0b604…

MALICIOUS

PDF

73.7 KB Created: 2021-03-11 06:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c2483f5b087a9ad291e170ee8cdd5c5 SHA-1: e09397c0c5b4e45602c7e41909bb6a52e8c748ac SHA-256: c9f2c3d68ca0b6048ad500926c366acdbc45bf0579ecc0a0525601f8c2194567
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are flagged as potentially malicious or unknown, suggesting a link farm for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links designed to mimic search engine results. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=chemical+kinetics+reaction+rates+worksheet
    • http://zegosuvavanow.22web.org/28912019616.pdf
    • https://cdn.sqhk.co/zipaduteki/jijhegd/pictoword_cheats_level_62.pdf
    • http://ch-redirect.icu/adios_nonino_partitura_piano_freehew1v.pdf
    • https://cdn.sqhk.co/bitowiso/hbjjcii/57605029792.pdf
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fe7ae61031b2.pdf
    • http://katomowubi.iblogger.org/new_home_walk_through_checklist_alberta.pdf
    • http://sarkife.site/893024280681ci6g.pdf
    • https://cdn-cms.f-static.net/uploads/4486742/normal_602f1c6858739.pdf
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6016e4263e444.pdf
    • https://cdn-cms.f-static.net/uploads/4451353/normal_602273afe4559.pdf
    • http://levantegroup.net/67308972096ztiny.pdf
    • http://natlegend.space/craftsman_evolv_table_sawi8fm1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_9e15cf2c437843ab95bde527ca384600.pdf?index=true
    • http://kopuperoki.epizy.com/android_google_maps_language_settings.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_27d458b76a974ac0a52a66f7cc486571.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_ed43713d06ae4e4d98886a8e98debf84.pdf?index=true
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_7af1e91b2f894f4cb87413a23b3db7a2.pdf?index=true
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_e162946dba5c4080ba23ec86491e8dc2.pdf?index=true
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_7d8daa9fc9974c2f900cdce5ea072bc7.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_da4d563e69fc4bac82880c36d59b0d8c.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_off0000e3b9.bin
4233a9cf0c46ad228f8ef1249171a245df9fd9fcae3304a5889b7691ff63edd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 5100 bytes
font_01_sfnt_off0000f4ec.bin
81827ea265f29f59e9c97cf3fd22cf7883b38a4ff1e659d1884cb751ab9d1031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10592 bytes

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