Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0bcbb51ee8d3be…

MALICIOUS

PDF

101.0 KB Created: 2021-06-01 04:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98ac204dc678e2b5b15480809cb22f4 SHA-1: e0c130fd68fe2842d49ad5ea3b8fb430f42755d2 SHA-256: ae0bcbb51ee8d3beba91f211d84583be2acde4243fd170426381e23245e4985b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/pbw?utm_term=movie+date+night+at+home+gift
    • https://cdn-cms.f-static.net/uploads/4465123/normal_6068f2fa1a922.pdf
    • https://cdn-cms.f-static.net/uploads/4465930/normal_6029696fb25d4.pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_604e92afebd99.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_6035ebc75bf40.pdf
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd643bf5f496.pdf
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/gozonugisu.pdf
    • https://cdn-cms.f-static.net/uploads/4463552/normal_602e6363d916e.pdf
    • https://cdn-cms.f-static.net/uploads/4461763/normal_6052ebe409a8c.pdf
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/subizoxafom-jakin-taduzitekig-zukuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://garigor.pbworks.com/w/file/fetch/144428439/java_1.8_0_191_download_offline_installer.pdf
    • https://uploads.strikinglycdn.com/files/d470503e-08d8-4596-a4cf-b298d406cff4/xabefe.pdf
    • http://buvavipoluvu.pbworks.com/f/how_to_write_an_email_requesting_job_shadowing.pdf
    • http://xoxafepapesu.pbworks.com/f/screen_recorder_with_facecam_and_audio_video_editor_apk.pdf
    • http://pokuwatosat.pbworks.com/f/download_game_efootball_pes_2020_mod_apk_offline.pdf
    • http://zezimin.pbworks.com/f/how_do_i_get_netflix_on_my_android_tv_box.pdf
    • https://uploads.strikinglycdn.com/files/e807057a-4f53-43cb-b731-cbfcc499503b/how_much_does_a_lab_tech_make_a_year.pdf
    • https://uploads.strikinglycdn.com/files/474999e8-42c8-4c65-b65c-4e777a58672c/nuvision_10.1_tablet.pdf
    • http://nosiravuga.pbworks.com/f/unutursam_fslda_gel_yada_git_mp3_indir.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144439602/kijavozosapagefobije.pdf
    • https://uploads.strikinglycdn.com/files/722ecfc4-0087-4e80-a091-72f745607359/call_of_duty_mobile_mod_apk_unlimited_cp_download.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144412215/adobe_photoshop_classroom_in_a_book_2021_release_download.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139f7.bin
2c37db24b6676dda9ddbb8f4422fdc14d9f251a4f6a8a99b7af7f0f506d66aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 5080 bytes
font_01_sfnt_off00014b36.bin
fdab3100a34f6af16b64c9d65808f2820de67b72c60b566ff4a46304edb381e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B36 11304 bytes
font_02_sfnt_off00017116.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17116 16312 bytes

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