Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c625e640e5d940e…

MALICIOUS

PDF

84.5 KB Created: 2021-06-05 22:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 533b64955527f8e98555458f15ffbdf4 SHA-1: 827465d9a0a97454f91711905b91e8268281c714 SHA-256: 4c625e640e5d940e7532d91898457ae45311995da7a70747e4a52e6b375b2c2a
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or spamming operation. The primary URL, 'https://ketchas.ru/pbw?utm_term=how+do+you+tame+a+zombie+horse+in+minecraft+pocket+edition', suggests a lure to a website disguised as a search result. While no scripts were directly extracted, the PDF structure and the high number of external links strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=how+do+you+tame+a+zombie+horse+in+minecraft+pocket+edition
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5fe0b95e4a96c.pdf
    • https://static.s123-cdn-static.com/uploads/4493602/normal_5fce8f6ec18d3.pdf
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/tekinoxuje_dodawovoze.pdf
    • https://static.s123-cdn-static.com/uploads/4403946/normal_6000a25d68af5.pdf
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/pujew.pdf
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/vipapureka_gofuxudumovufaz.pdf
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/depobewivubanatumogo.pdf
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/589084.pdf
    • https://cdn-cms.f-static.net/uploads/4413361/normal_606c8f89a3170.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3270e7d7-7bad-4d8c-b047-cfc0a1d7fd1e/kixavexuzonurun.pdf
    • https://uploads.strikinglycdn.com/files/f8fe3d87-161c-4d49-a1db-fc792e444055/jurassic_park_3_full_movie_in_hindi_hd_download_filmywap.pdf
    • https://uploads.strikinglycdn.com/files/f92cadb1-0f86-433f-b4a4-97483da5745f/kusosivigarud.pdf
    • https://uploads.strikinglycdn.com/files/3cd894cd-ba2c-4f23-9428-58b11dec6c93/asus_router_n66u_default_password.pdf
    • http://pamotekegopa.pbworks.com/f/xakopevisimokagab.pdf
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144471633/where_does_that_youtube_family_live_right_now.pdf
    • https://uploads.strikinglycdn.com/files/fa7f7461-7423-4a63-914f-e7e8cb4062ae/shadow_and_bone_tv_series_cast_darkling.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144589203/how_to_write_monthly_accomplishment_report.pdf
    • https://uploads.strikinglycdn.com/files/ad67c138-e3df-477b-b93b-3935ee692ffa/does_the_darkest_minds_have_a_sequel.pdf
    • https://uploads.strikinglycdn.com/files/82e7d737-4e79-44e8-b856-92cd9d1026f1/o_que__escorbuto.pdf
    • http://zilebunod.pbworks.com/w/file/fetch/144424893/musukadubumote.pdf
    • http://siruzosu.pbworks.com/f/will_centipede_bite_kill_a_dog.pdf
    • https://uploads.strikinglycdn.com/files/cfb66515-6f82-4b14-879d-e139310ec89f/1629146364.pdf
    • https://uploads.strikinglycdn.com/files/c992e70f-1533-4736-8e5f-91a2c3f83d06/what_is_the_best_cordless_drill_kit.pdf
    • https://uploads.strikinglycdn.com/files/263b82ae-4bf6-4c6e-abc8-eec512b67ec9/88450949252.pdf
    • 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_off00010a32.bin
a18f332a959cff1a5d85a413a888eab904d895f4b0704ae1f2fa63da4450fdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 5772 bytes
font_01_sfnt_off00011dca.bin
34046ca1151b4594828dc53fbe86764243bee09f9529dad5462c162f6a7931f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 11384 bytes

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