Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae5a858a21b669d…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 12:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8fad5d303a12a152b383b49bc787d35 SHA-1: 7fc81ef566e730a7eff299ea427c91da1eaca76a SHA-256: 5ae5a858a21b669d51252ae1174635ed16e327c43b2c709aed77a161b2957868
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous external links, with one prominent URL pointing to a suspicious domain that likely hosts a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=romeo+and+juliet+movie+2013+google+drive
    • https://cdn.sqhk.co/wobuwozavenu/gbicux9/71711327716.pdf
    • https://cdn.sqhk.co/gogadibavuta/dciahdG/217425951.pdf
    • https://cdn.sqhk.co/fugapaloter/ihgghgV/sejigeguluzoxusaligijolu.pdf
    • https://cdn.sqhk.co/tatidukigag/hbjgid2/xusitamowumotuxoje.pdf
    • http://blablablacar.online/song_jesus_youre_the_center_of_my_life56aed.pdf
    • http://littlenat.space/mentalist_season_5_subtitlesavph5.pdf
    • http://ch-bewertung-2888.xyz/835398346873qzo3.pdf
    • http://kamikofonem.mygamesonline.org/aditya_hrudayam_stotram_lyrics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5cdb6402-1629-4de6-9fab-bfab3436d8b8/whirlpool_quiet_partner_1_reset_codes.pdf
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_deb26a234c094806b2bad69f852fb67d.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_669e1c280f714262af966258d29213e5.pdf?index=true
    • http://rogofideb.onlinewebshop.net/what_is_the_meaning_of_listen_verbal_abuse.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_34a6fa69ff724b3595a7bcddcd5c42f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fa00205-f712-4269-9c98-b5e2c1b825e4/nuvedemukemezexurexesowe.pdf
    • https://uploads.strikinglycdn.com/files/1a1224f4-878e-4526-97bf-608fac2bfee1/ap_word_family_worksheets_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/ffaf93c6-369b-449f-9340-5df25345cee1/sovinulisuki.pdf
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_ece4a8177b0c4c43a2b1147292c74a50.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_45b69e62f04a4c3ab77c85ccf5804dc0.pdf?index=true
    • 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_off0000ef3c.bin
d44e11e220624727efd34569f6caaa76f636dfe6fa3521eeff2345efbbaf42f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 5600 bytes
font_01_sfnt_off0001024c.bin
6fc93ee7fd3377a9571a25a92bd6ddb4315aa343c7b02fdda61c0ac27a471053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 10796 bytes

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