Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18f9ae55ee03c83…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 16:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5d7a921ed084f9a1d58df9cfe80005a0 SHA-1: 74219568bd12f7798ed48ca93f4fcba960bb9977 SHA-256: f18f9ae55ee03c83ce85e7d1369464ef016406e008f0f32f1105461dc37d4492
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to English exercises, likely serving as a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=czasy+tera%25C5%25BAniejsze+angielski+%25C4%2587wiczenia+pdf PDF link annotation
    • https://cdn.sqhk.co/zegodoxelob/JgjaZmd/never_gone_2016_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_605450b74ecce.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/bozozadirojotibubaranogog5kgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff7129637eb5.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/foWiig3/dodibavojovokital.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/portfolio_download_freekzcy6.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/aS7jfFi/mapuvogomuvevatiw.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hvhfgbj/snappers_key_largo_hotel.pdfIn PDF document text
    • http://look-hotel.com/40492144079xr1gp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5ffb8dd92e13a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5fc8eaed0fdef.pdfIn PDF document text
    • http://kufeduli.22web.org/archetypal_literary_criticism_examples.pdfIn PDF document text
    • http://evakuator-uga.ru/kosaxufor4b9wd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3a25cc-4ecb-40cd-aeca-49df1c6ede8e/how_much_does_a_60_000_btu_furnace_cost.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_0bda8908b0494ddb9e0c08dd69e65aca.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_5760cde838594cc5832d53c46f942d75.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_4bf7f58cdc944a3cb1d37aded8296944.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/614db39a-5e98-4454-b074-7672a1684467/cant_access_my_cloud_dashboard_windows_10.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_3bc800f27af141e29abbdfde6ed63da3.pdf?index=trueIn PDF document text
    • http://rufeluvogoweva.epizy.com/jofub.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 5820 bytes
SHA-256: b0f6073efd2922557ce5f2f9551c851db21fb8b5498bf75b0b2cf3a305a5a5b7
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 12028 bytes
SHA-256: 3295cd47341279fbe0c661c512439cc97faec3d014211ea5d6f58037fa8ccf5c

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