Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0e121453d15b2…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 10:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cc93612216c12cb8a5fbcd1d451f22ec SHA-1: c439d9fd5526f72155beaae35e5d30eced5fdf0c SHA-256: 3bf0e121453d15b2c4e742644cf9d5ef14f5b51b10f5ce8e5e029c7009abbe4b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to direct the user to external malicious resources.

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://gimoguvi.ru/strik?utm_term=how+to+handle+disruptive+students+in+class PDF link annotation
    • http://jodazok.22web.org/9707292694.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/pPygdhb/jegavifukemuzupikuxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_600feadb31a62.pdfIn PDF document text
    • https://cdn.sqhk.co/gogamosujimi/JgigdQU/the_labrant_family_new_videos_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/6XGiidt/different_font_for_iphone_xr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fede8320f67c.pdfIn PDF document text
    • http://vofufime.mypressonline.com/arduino_uno_dimensions.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/in_the_agile_approach_to_software_development_the_definition_of_done_refers_to.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/jbjbgjQ/xumenaxofed.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/rodirizu.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/74797521311.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/qXSzcig/lunametemut.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://soroxafuvi.epizy.com/stern_louis_canales_de_comercializacin.pdfIn PDF document text
    • http://tewalilakoj.rf.gd/bronze_age_mindset_free.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/wajizoren.pdfIn PDF document text
    • http://zepumibofisi.epizy.com/what_are_your_best_qualities_interview_answers.pdfIn PDF document text
    • http://ralenosozizog.epizy.com/what_is_cibola_burn.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/adobe_creative_cloud_remover_cleaner.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_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 5156 bytes
SHA-256: 25643e37250f5f279936c84342416050d15315853db321b0ec29f31473198e48
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 11280 bytes
SHA-256: 0c7dcc3a4bf0e7cbb5c9ae0e018fa24edc874f05949188b7228814c9432ad2b4
font_02_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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