Malicious PDF — malware analysis report

Static analysis result for SHA-256 4385d01299b06074…

MALICIOUS

PDF

85.1 KB Created: 2021-05-07 18:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 714382ded21872f4060f45bad26b6ac2 SHA-1: 10b154bbb7d0215939a198fa75291acf242ce856 SHA-256: 4385d01299b06074be3f5a0eb14c05131fe4639a713c4d6bc268201c31dd6ef7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=jbl+xtreme+2+charger+best+buy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451217/normal_5fc99d1f373ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6023739638ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_601da7b72ea49.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/defuxofijade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fca7450a2769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415070/normal_5ffaa178dae16.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/c73308d5-02b0-4886-8a32-941abd220530/how_much_do_you_make_a_month_in_army_reserve.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/properties_of_addition_worksheet_grade_5.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_f3c79d46822d4d2a89d60b1a1fe2612d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ae743e-11a2-4594-a4b9-c047bb125d50/57232851210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3573fb-a696-4d8f-bf6d-019f59bda2d0/where_can_i_buy_ethanol_free_gas_in_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b860e9-6862-4a5d-8873-aa21b294aea0/first_aid_usmle_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b887e1a1-55a3-4e26-8a02-29867e0898e8/dungeons__dragons_core_rulebook_monster_manual.pdfIn PDF document text
    • http://bulujulu.rf.gd/51816578463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e04fa9-cc7e-43f1-ae78-323ead8159db/intex_sand_filter_manual_sf80110-2.pdfIn PDF document text
    • http://pizobuxawefi.rf.gd/57561994691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a16944-e7f9-4b8e-9563-3255ce5dc763/niv_study_bible_zondervan_app.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/lotera_de_tablas_de_multiplicar_para_imprimir.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_061a0a9f32164b228b4084ffcf8cefc4.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_a2fe54165f2445f585d7817465139a12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a51eb8-abb7-49c9-a36e-d8a40a65b72f/como_eliminar_el_covid_19_del_cuerpo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec7167f-3750-4109-b23c-6b47336d732c/foscam_fi9821w_v2_android_app.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5644 bytes
SHA-256: ec8b95ccbb3c54cc31aa77654e264bec2e46339ca851842ea83f36a00b32d981
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 11296 bytes
SHA-256: dc30292992d3427d52e603936ecfd2748ce3f5bbcec23196942a3970d2d64146
font_02_sfnt_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 16616 bytes
SHA-256: f8ae70fe08f3f51d233476c189f9f1652579ab6257c6fb20d6d7e0d9487939ca