Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffe1ae3d2479a7f…

MALICIOUS

PDF

75.7 KB Created: 2021-03-10 07:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f60bce1068bd8c670eeeada2641af46 SHA-1: dcde14e71974081380840f46c9ec88a93d09f461 SHA-256: 5ffe1ae3d2479a7f8fc887fb7d0ce37548069279f78860437670e8ef866e0be5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating the presence of external URIs within the PDF. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host malicious content or redirect to external sites. The primary IOC is the external URL found within the PDF, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=contemplate+use+in+sentence
    • https://cdn-cms.f-static.net/uploads/4451375/normal_601316ab5cda5.pdf
    • http://golden-bridge.pro/jang_newspaper_25_august_2019_downloadj75h1.pdf
    • http://autobaff.xyz/data_analyst_certificate_course_freek71rs.pdf
    • http://davupopebuwiser.sportsontheweb.net/14985294018.pdf
    • https://cdn-cms.f-static.net/uploads/4450148/normal_603a5f64b398f.pdf
    • http://like-store.site/book_apple_genius_bar_appointment_carindale3jzt8.pdf
    • https://static.s123-cdn-static.com/uploads/4427094/normal_600026fa290ca.pdf
    • https://cdn-cms.f-static.net/uploads/4459625/normal_6025f56f636ec.pdf
    • https://static.s123-cdn-static.com/uploads/4422368/normal_5fe403e47cbb5.pdf
    • https://cdn-cms.f-static.net/uploads/4454163/normal_604422b3ecb0e.pdf
    • http://biolinkus.me/tableau_book_font_downloadjpd1u.pdf
    • http://parazepurafeza.medianewsonline.com/analytic_geometry_notes.pdf
    • http://yatvoyya.fun/how_to_apply_for_2_year_old_childcare_funding7kptr.pdf
    • https://cdn-cms.f-static.net/uploads/4371023/normal_6046316b737fd.pdf
    • http://fishing-rods2.club/pyromancer_dark_souls_1_guidel7dua.pdf
    • http://vsedlyatebya.xyz/pigonggq2i.pdf
    • http://superheatbelt.xyz/kumexorakunirurifugozixu0y6t9.pdf
    • https://static.s123-cdn-static.com/uploads/4453743/normal_5ff5391040736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vubelifijam.atwebpages.com/selenium_basics_for_beginners.pdf
    • http://rususekobijo.myartsonline.com/xovojogurodofije.pdf
    • https://uploads.strikinglycdn.com/files/0c6fdd92-3484-4e68-bc52-707d5ec80b8f/wezejedigege.pdf
    • https://uploads.strikinglycdn.com/files/5cc9a98c-d644-47c0-9de8-34334da14763/91490479792.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_off0000eec2.bin
b21e10a19f76ebff8e9b25da36a270c97acbd783b3de3f23a82e31e73e4bd55a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 4888 bytes
font_01_sfnt_off0000ff48.bin
982d8eb6410f481143f68a7e46d83efd939ff6bedcfe35a69bb9021c265037be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 10180 bytes