Malicious PDF — malware analysis report

Static analysis result for SHA-256 51be90c33d0f46b1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 20:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b47278ebe91657263b6000a2686c7612 SHA-1: fb3d88efed680b86236b57da64c5af2186e1c43d SHA-256: 51be90c33d0f46b11cc4e27c5ae5a074d099d7cee97284f5e5b85d2b794172e0
96 Risk Score

Malware Insights

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

The PDF document contains a link farm, with one prominent URL pointing to a page that appears to be a lure for a driving license medical report. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a large number of external links were generated, likely for SEO manipulation or to host malicious content. No scripts were extracted, but the presence of numerous external links indicates a potential for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=driving+licence+medical+report+form+over+70 PDF link annotation
    • https://winetokazujubap.weebly.com/uploads/1/3/4/3/134321452/be7e79feadd56.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/29f0ab0f.pdfIn PDF document text
    • https://lefoteliwe.weebly.com/uploads/1/3/4/0/134095852/7bd151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_60193562317fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fd07deb2f585.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/pakafone_jibava_gusunijoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/278297f4-5082-46e7-81dd-580252085786/the_island_of_doctor_moreau_movie_1977.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/combined_variation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/the_5th_wave_age_rating_uk.pdfIn PDF document text
    • http://bebinuvejaxate.rf.gd/facebook_album_chrome_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6030f0b6-cec2-403f-9c2e-36633809f017/besabexexapev.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/super_mario_3d_land_special_4-3_star_coins.pdfIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_1f618543a3674d9a9c85c964d2713864.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/66931175527.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_0a17ce70d6ec45179ecb379de4de053c.pdf?index=trueIn PDF document text
    • http://jodudakafogav.rf.gd/noco_genius_g7200_for_sale.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_19652c41141b42f0b0ea1ceb2fa30556.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 5368 bytes
SHA-256: aece3c109912926d72819136d5cd58797f47626e9c9ea52ebe49364ee908d05c
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10876 bytes
SHA-256: 4a2c70214b06beaa68dc3aa29326f475e0b181442b5919dba37352787a28ae6b
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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