Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10509b049b12b27…

MALICIOUS

PDF

78.9 KB Created: 2021-05-28 19:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 64c34045f5a709ccc523829033f8b33b SHA-1: e99aaf741cfb2ea27f70b5ad44773731f31d93db SHA-256: f10509b049b12b273cd30b68f446f40d8d7add17e4c4b71b57566d9dc252b256
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://pelibifir.ru/strik?utm_term=how+to+learn+german+a1+at+home'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=how+to+learn+german+a1+at+home PDF link annotation
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/kasidasapazo.pdfIn PDF document text
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/e799eb988a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fe6ad8b397f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_6011eca70ccbc.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/b3c21a496.pdfIn PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/josajitexelemupoduzu.pdfIn PDF document text
    • https://bojirutewum.weebly.com/uploads/1/3/4/6/134622564/81449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_605d693e4b468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_602c748bea86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_606836959fb1f.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/b373773f-70ed-48b0-ac32-6d0be5a5d020/dremel_multipro_model_395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2545e0-ad47-48b3-839c-8c08e43fde4b/77129168917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abb88a1-52cd-49cd-9dc8-ce4d62928923/tekejuvibezabugakosakisir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3599a9-b00d-4bfe-8daf-754ad511f02e/30658302991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12688a4-0427-434d-80f5-2d693cf8b46b/stock_exchange_courses_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dc6729-3cd6-4b3c-80f3-12174e741615/nugudefonirava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0caeab-b87e-4864-9c9d-8998b6013e43/ap_world_history_unit_1_quizlet_1200_to_1450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e736e16-7237-4db7-a6c2-0b11ddf0ed83/when_did_ancient_greek_democracy_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253fa404-ef96-4aa7-88f2-2dc7be9a61cc/1750091173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b3b807-596f-40f6-8da7-7e50bf786585/63504993379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5815e29-598c-421c-ade0-2e5094ad7d98/duele_amar_optimovision_capitulos_completos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d7f145-c8fc-46a3-b493-23aa22f818bb/xedifokufezosisado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d81f14c-a0d3-459d-bf5f-ae7566eaf3c2/1915343864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db712098-8acd-481c-829a-e4bad929bbc1/46922740342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b355d78c-2032-40fe-9eaf-4c5a20ee6280/pensamiento_y_literatura_en_espaa_en_el_siglo_xix_idealismo_positivismo_espiritualismo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b6219c-305b-426d-8991-b05f4800d723/tropic_of_cancer_countries_libya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497a5b9a-3f39-48d2-99bf-71d0a65ab429/fezeguxugovajada.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 5028 bytes
SHA-256: 35d8748a1152d4aced6beba3d34283eb9d00dc94eaefbb1e589da70bb04933db
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 11764 bytes
SHA-256: bdbf71e100e89c54b601232b28f26e05a73aa15b905f74f6dd2632e950ea2c80

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