Malicious PDF — malware analysis report

Static analysis result for SHA-256 35043d794cd4dc89…

MALICIOUS

PDF

84.5 KB Created: 2021-03-15 22:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b3dc8e185a3576d3e432f501b41122 SHA-1: cf36d16ec18f06ca4a618d9d118b4206c3ec7029 SHA-256: 35043d794cd4dc890338b20cf6190e1b09128c60bf9c7ca7051283abb455c84e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jacksth.ru') and another identified as a link farm on disposable hosting ('pelubexeto.getenjoyment.net'). The document body, though heavily obfuscated, appears to contain keywords related to popular electronic devices, suggesting a lure for potential victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=beats+studio+3+m%25C3%25BC+airpods+pro+mu
    • http://pelubexeto.getenjoyment.net/sub_zero_wine_refrigerator_cost.pdf
    • http://hookup753.fun/rezatezazg3ens.pdf
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/polunidugebopu_sosujir.pdf
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/lipegazunekoxakoga.pdf
    • https://gosalojuwik.weebly.com/uploads/1/3/6/0/136050429/8f997194c.pdf
    • http://apeech.ru/26341564400syem7.pdf
    • https://vujufosidomo.weebly.com/uploads/1/3/1/4/131482916/1034534.pdf
    • http://fujigukatujewu.medianewsonline.com/bowate.pdf
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/gaweneda_kaxawifuwegabi_vewesim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tosopipates.epizy.com/bitmap_image_viewer.pdf
    • https://s3.amazonaws.com/lomuper/32203252534.pdf
    • http://nukilaba.myartsonline.com/27022773718.pdf
    • http://pokitudid.epizy.com/airtel_tv_app_for_android_4._4.pdf
    • https://s3.amazonaws.com/fovezewi/guxilomosov.pdf
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_6b5bec437c07446f97d0d1c1eaf7b995.pdf?index=true
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_41c02c083de943ca9d8a69c73635df2b.pdf?index=true
    • http://xemugapot.rf.gd/99646078645.pdf
    • https://s3.amazonaws.com/lekizopiloref/saira_narasimha_reddy_teaser.pdf
    • http://wetoxisifogif.epizy.com/autocad_software_free_for_pc.pdf
    • http://rotufixijisadi.onlinewebshop.net/selections_from_the_complete_works_of_swami_vivekananda.pdf
    • http://pujumek.myartsonline.com/where_are_simpson_pressure_washer_engines_made.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_off0000fc59.bin
b9abc27d65e9303cac8f4bdefb969d230a00d36f0018ac20c242f48e89968a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 5408 bytes
font_01_sfnt_off00010e6d.bin
c058683e2c01f2ab52e2e2551efc52bdd80a8b9b6aa4ad7d2c57b3debe933855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16860 bytes

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