Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5432f34532e59c…

MALICIOUS

PDF

73.7 KB Created: 2021-03-25 06:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f99787057d4b6db3b74ac342bbe1bc5 SHA-1: 5e35dee748b5b9a39a2f75ab68b773c8bfce38a3 SHA-256: 8a5432f34532e59c0cc0b699f777a1759f6569022aafc599d7b5370f99d7995c
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, flagged as a 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS'. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0' strongly suggests a phishing or trojan distribution intent. The embedded URLs, particularly 'https://soxebez.ru/award?keyword=conjunction+multiple+choice+test+pdf', indicate the likely attack vector is a lure to a malicious site.

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://soxebez.ru/award?keyword=conjunction+multiple+choice+test+pdf
    • http://erogan-oficial.site/3529887751fap2r.pdf
    • http://kellys.space/how_to_clean_quadrafire_santa_fe_pellet_stove6r6kh.pdf
    • https://cdn.sqhk.co/sokulutesi/bja8ajd/pencil_sketching_for_dummies.pdf
    • https://cdn.sqhk.co/rijomawonuj/3gcyARW/free_fire_hd_wallpaper_2020_dj_alok.pdf
    • http://firakil.22web.org/statistical_hypothesis_test.pdf
    • https://cdn.sqhk.co/terasovo/ifyjh62/80287912025.pdf
    • http://businesslinecenter.com/xonopusovezegivanidafix1jal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wajodojizofe.epizy.com/98189977205.pdf
    • https://uploads.strikinglycdn.com/files/1c7e257a-b7c4-4943-bed8-e8538908d676/boss_tu-2_bypass.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_fa034f9f159f49068ba19255164a6836.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_b44cc761fd3741699ef0d90b1ee59de7.pdf?index=true
    • http://befojarariwowab.epizy.com/happy_birthday_bestie_song.pdf
    • https://uploads.strikinglycdn.com/files/937dd408-1ffa-4fce-a83e-de42944d4ba0/8253594625.pdf
    • https://uploads.strikinglycdn.com/files/b52a9f23-f024-466a-8e58-442a669d7dd1/how_to_start_a_johnson_outboard_motor.pdf
    • https://uploads.strikinglycdn.com/files/8704f5de-b130-4d3a-b3c7-26395ea95980/marvel_movies_in_order_to_watch_them.pdf
    • https://uploads.strikinglycdn.com/files/b4a691d7-75b5-4ea8-af06-eea624a21737/what_is_the_primary_social_purpose_for_the_rules_and_practices_of_the_criminal_justice_system.pdf
    • https://uploads.strikinglycdn.com/files/d40762ba-7e81-4ce6-9d15-7e3f136257a9/33870433948.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_3239e38636e244a6bc739a216d13c1ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6304d631-b615-4b2b-aa5a-d4d0c2d05ed2/bexomivotawemixexitoragur.pdf
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_8bc6bd19021344339c61ad4df2a90d42.pdf?index=true
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_34cfa4991f1b42279e55c88b5b2032ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/241d0957-d3e0-4dbb-9704-627efbdd0bfb/tusavuwefonuveroxu.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_off0000e1ab.bin
5bd593be623070ce0ef17fafc5eeb779b5a09c86ec76b3d678410cdde5e8ec02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 5072 bytes
font_01_sfnt_off0000f2cd.bin
a750b0bf5554889639bf243edf234bd48fe368576458776ba81e1ccfd2317c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 11412 bytes

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