Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa998fdf3e1068cc…

MALICIOUS

PDF

66.7 KB Created: 2021-04-02 06:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd6bc38135080ee078c78a841036c3ff SHA-1: b7a2d610ca924f551224353929b67792314191a1 SHA-256: fa998fdf3e1068ccb4c1d070a575847a5ee323e4b421af537023859eddfa3b06
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to external sites. The primary malicious URL identified is jumiwimov.ru, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/aws?utm_term=skittlefish+natural+selection+lab+answer+key
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5fd39a92e8813.pdf
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ffcff90e8f92.pdf
    • https://static.s123-cdn-static.com/uploads/4370319/normal_5ff918b6388ad.pdf
    • https://cdn.sqhk.co/gixegusu/gdIBijO/knife_block_set.pdf
    • http://sopugepibimel.mypressonline.com/84153832166.pdf
    • http://zudepogumo.medianewsonline.com/alignment_test_on_drilling_machine.pdf
    • https://cdn.sqhk.co/bexefoboxevi/GuihiiX/amazon_ping_pong_table_top_for_pool_table.pdf
    • http://vulifux.66ghz.com/6338828964.pdf
    • https://cdn.sqhk.co/xojelumegasi/aBhh9hb/rujenexikuzurusixelogafe.pdf
    • https://cdn.sqhk.co/fapewejav/gi5Ihov/44040412945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/saziwijaxodav/mejores_aplicaciones_android_para_ver_peliculas_gratis.pdf
    • https://uploads.strikinglycdn.com/files/e66ccdfd-bb7c-4309-8293-ab0417857dca/bafaradupedege.pdf
    • https://uploads.strikinglycdn.com/files/82c29fe7-403a-487d-942c-ba045edd95fb/second_language_acquisition_theories_timeline.pdf
    • https://uploads.strikinglycdn.com/files/cbf35bef-5c5a-407d-a0a5-81b3e9f0bea4/57580513881.pdf
    • http://mevusajilitum.rf.gd/karokumalasiru.pdf
    • https://s3.amazonaws.com/nilafafakem/mandl_shaw_quantum_field_theory_download.pdf
    • https://uploads.strikinglycdn.com/files/a016fc86-b649-4693-bbdc-a45904711102/how_to_prepare_for_hr_recruiter_interview.pdf
    • http://norenebe.rf.gd/53865716719.pdf
    • http://jesudojisa.rf.gd/beach_buggy_racing_app.pdf
    • http://vudemiziwifimo.epizy.com/guideposts_writing_contest_2019.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_off0000c637.bin
630805f23f0fc2659dde88780b7d1b866ff019efa350074e9a8b266810f9d422		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 5468 bytes
font_01_sfnt_off0000d8e5.bin
54f139a06f016a216783620126c706501916ed302c1537ba19a8c9481685cdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 10084 bytes

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