Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e89a8d2d05dc4c…

MALICIOUS

PDF

72.5 KB Created: 2021-03-16 00:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c1e2732f06bf35415f9481dfc46ffa SHA-1: ebb72fdc0c30df8fd1c6e0e221598e116626368a SHA-256: f1e89a8d2d05dc4c2f783c340085f26e697259b13f1a9e7f777fae0e28f95bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF document contains numerous external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are used to redirect users to external sites, which is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=intex+saltwater+pump+cs8110+manual
    • https://cdn.sqhk.co/sadetujadufi/Fieggje/mikibisigobema.pdf
    • https://cdn.sqhk.co/suxevevagova/rzushgj/juego_de_gumball_super_disc_duel_2.pdf
    • https://cdn.sqhk.co/gebitasixa/fqifhiF/kedugexufinamananonu.pdf
    • https://cdn.sqhk.co/nijazulagoza/ifjfxjh/bowling_masters_clash_3d_challenge_game.pdf
    • https://cdn.sqhk.co/mugejufunij/a0giho4/carrie_underwood_latest_song_2019.pdf
    • https://cdn.sqhk.co/jimevexir/rhiihgg/redream_android_save_location.pdf
    • https://cdn.sqhk.co/ruxuvedije/iigS7gg/pilomatrixoma_on_head_treatment.pdf
    • https://cdn.sqhk.co/vipatajase/RTgfjfc/4k_gaming_wallpaper_for_pc_zip.pdf
    • https://cdn.sqhk.co/lomasamube/gQ9dsgj/hitman_3_locations.pdf
    • https://cdn.sqhk.co/gorokipo/ifjd0gj/az_screen_recorder_no_root_pro_apk.pdf
    • https://cdn.sqhk.co/luwagoma/VibgoHx/fusodiv.pdf
    • https://cdn.sqhk.co/nububufi/ibhbbgk/99973693327.pdf
    • https://cdn.sqhk.co/wenewojufaj/hg5jjHN/hover_1_pioneer_scooter_parts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_fcb3f1c544c64032a5ff55af11574952.pdf?index=true
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_8544ff9a792a49d2b896bbd2bd828a45.pdf?index=true
    • https://s3.amazonaws.com/zodererezuzuxi/safafibanik.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_da73839ae00f4f37babc09a26a785a6a.pdf?index=true
    • https://s3.amazonaws.com/rizezobabub/88104004915.pdf
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_3fab5fa495b1428cb3c30897100a51fa.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_off0000db3b.bin
082b5a499bc9f7e174262c4ea243ef32f0996fdceb5e5bfef6a4b2b6232ceca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 5564 bytes
font_01_sfnt_off0000ee2b.bin
6a9d71d7385260500971fd3503b27a868fce77604a1e0fb05d32bd97d5f96177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10864 bytes

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