Malicious PDF — malware analysis report

Static analysis result for SHA-256 f209c270dfb2f8fb…

MALICIOUS

PDF

98.5 KB Created: 2021-03-26 17:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 51da9687ecc88e0f48ed80289c4837c9 SHA-1: bf52813560052fbdbd09f33a383d829f0d8333b2 SHA-256: f209c270dfb2f8fb91077d3bc149725b346d4c5eb7e1cff101f4d78bc2f408a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jumiwimov.ru/award?keyword=metallica+blackened+tab+pdf PDF link annotation
    • http://selomankap.space/ding_dong_texaslbo6t.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/55d4d9ea.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/9728350.pdfIn PDF document text
    • http://nubolats.xyz/848359869179pv56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5ffa9e3d3c075.pdfIn PDF document text
    • http://bonboxstudio.com/lecturas_domingo_xxvi_tiempo_ordinario_ciclo_cxtlwx.pdfIn PDF document text
    • http://skidki-day.store/bapipuxizamuziresuvuat6fk.pdfIn PDF document text
    • http://fito4ka.xyz/funciones_y_responsabilidades_del_colegio_de_profesionales_de_enfermera_en_puerto_ricose2gp.pdfIn PDF document text
    • http://romeoplanet.club/48477319219ttpzl.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/c8c49626912.pdfIn PDF document text
    • http://trudogoliya.online/dobulaxutonatuvujebd9zxs.pdfIn PDF document text
    • http://maewallace.com/i_remember_mama_tv_showr8cwx.pdfIn PDF document text
    • http://top-agent.ru/pci_serial_port_driver_dell_optiplex_755_windows_7_32bitzrqiy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5fd9d8b91c9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_603540d3b4fce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fc6cd6624f96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_c59b9022047b48508ef8b172417209bb.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_4b5172a91f664c288fd51e37fef0388c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71521f61-611a-495a-bb31-b8b927ee2e5d/how_much_does_it_cost_to_fix_the_stabilitrak.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_73f3148d331345a180c283e23efbbd39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d755745-4cf2-42db-a4ae-52c08c1236da/what_does_engine_service_now_mean_on_ford_focus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aff1ed2-cf59-4442-adb5-8f23cbefa8c7/buzarajiwalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecccba44-fb76-4e5d-9344-331425a627b4/kaplan_asvab_login.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_8e3271c4b14f4766bc333d2213628f73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5367a92-2597-4233-a063-9222263519ab/33229096870.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_e3f43a50b31f4a50ba5e5e6738506653.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 12820 bytes
SHA-256: 9d95dedd139419346e2714f0ebedc8c5d3469fd488b288b9152693d7f1699806
font_01_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 5084 bytes
SHA-256: c653632b9c962b295b89de170129c6e6f18d5ad6d5b3b0ca1eb4aca7196a061a
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 11880 bytes
SHA-256: d4c998a4025790b8163975da9a1eca7f31b96d0d8729e5a6354536b9f07dc132
font_03_sfnt_off00016513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16513 16160 bytes
SHA-256: 31f54bf1b2a0bd5fcefce680aa7bc0ab7b2c48a0f9a6877104dd616c0c0a5462