Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fff15751ff1a6b6…

MALICIOUS

PDF

84.9 KB Created: 2021-04-20 07:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d30b315f32e2b30950b9f4e0d21a9b3f SHA-1: 2a76508c470ccdf0d1f9508e9aa4d24a867f7ad5 SHA-256: 1fff15751ff1a6b6455273f7d19d84de834bd1b1a2662a36043e5bdae57612ef
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'botokaw.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to direct users to external resources, likely for phishing or malware distribution.

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://botokaw.ru/strik?utm_term=the+lost+ways+book+used+for+sale PDF link annotation
    • https://xuvitekopa.weebly.com/uploads/1/3/2/7/132712193/8730ceef997.pdfIn PDF document text
    • https://cdn.sqhk.co/tivaboloxome/0xarllY/68596749630.pdfIn PDF document text
    • http://mivetofim.22web.org/pafudosisewuludifam.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/fun_time_management_activities_for_high_school_students.pdfIn PDF document text
    • https://cdn.sqhk.co/simirides/fejdgjm/dance_gavin_dance_afterburner_instrumental.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://tb-films.ru/divine_mercy_parish_pittsburgh_fish_fryt1myd.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/492921ab3e.pdfIn PDF document text
    • https://kijabejinal.weebly.com/uploads/1/3/0/9/130969506/fowawufobod_jenikab.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/padulovise-xibaseberaz-sikejavoniti-mopunopimun.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/viruvagixe.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/angielski_dla_dzieci_materiay_do_druku.pdfIn PDF document text
    • http://nuweradumow.22web.org/digital_electronics_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jelasojeb.rf.gd/greenpeace_southeast_asia_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5bac65-fd5d-4e87-bb65-2c3a5626eca0/difference_between_evolution_and_revolution_in_tabular_form.pdfIn PDF document text
    • http://pikididubemet.epizy.com/arya_video_songs_free_320kbps.pdfIn PDF document text
    • http://wuxiwojimi.rf.gd/sanasujotav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad73205-a063-434f-a4af-fc0b7b854a1d/96120362086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f241b7fe-2815-432c-8a0f-ddbf0d8dd415/dell_optiplex_790_ram_slots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b37f4a6-09f3-4e83-bfe8-206f331cfe86/minimimig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 5072 bytes
SHA-256: f307c40be1e0fa70327b23b7d4643cf58bdfe2003f17be2ada24cf7397972581
font_01_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 11164 bytes
SHA-256: 52647b42ca23a03c703ddfee194d5ea544612f39596e569a55419e4d541c7997
font_02_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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