Malicious PDF — malware analysis report

Static analysis result for SHA-256 20106fdb9a8b6b2e…

MALICIOUS

PDF

84.5 KB Created: 2021-02-21 22:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 864f8bf91e68bfaa57487db7b9476cee SHA-1: 56748248736bfba9c9c41e462699121227238a21 SHA-256: 20106fdb9a8b6b2ee64f088ca9467a81c39e1043bd32cab1263034aea6d9f688
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to educational material ('Avancemos unidad 3 leccion 2 answer key'). The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=avancemos+unidad+3+leccion+2+answer+key In PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/iigiQ0k/55282622012.pdfIn PDF document text
    • http://ens-pictures.ru/57228166022rmtaw.pdfIn PDF document text
    • http://medyayazilimtr.com/autodesk_autocad_student_version_free0hnhx.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/jUhd1ib/talking_cat_rick_and_morty_voice_actor.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/kavufuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/hdaf7jg/kuviv.pdfIn PDF document text
    • http://ziratonis.iblogger.org/performance_appraisal_methods_ppt_free.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/LhjjirM/fotirakan.pdfIn PDF document text
    • http://mon-fortuneo.best/the_curated_closet_workbook_free2du8a.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/Ejbwghs/island_kingdom_water_park_price.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/Chhjeih/funny_guy_names_that_start_with_the_z.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/f1nhfI8/smart_family_companion_uninstall.pdfIn PDF document text
    • http://dabuvede.66ghz.com/polygon_names_worksheet.pdfIn PDF document text
    • http://meinekarten.best/coordinate_plane_first_quadrant_template1z89f.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://suwuwigo.rf.gd/glorious_day_casting_crowns_lyrics.pdfIn PDF document text
    • http://rerorupi.rf.gd/how_to_use_electric_aroma_oil_diffuser.pdfIn PDF document text
    • http://gapisoga.rf.gd/32245105184.pdfIn PDF document text
    • http://pupajuxefelere.rf.gd/grow_model_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 5488 bytes
SHA-256: 264b7275c8ac5a12c973f54f082fc942067669444ca1ba830d35e968780c03d5
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 12492 bytes
SHA-256: 5d80c993f42a7b060a7476aac73ddb63d86607f6ad6a646ffba0d415e6025942
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_03_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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