Malicious PDF — malware analysis report

Static analysis result for SHA-256 899bdc3b3762bcf4…

MALICIOUS

PDF

68.6 KB Created: 2020-12-04 15:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0969cb9a7c6bb2938eb9b45bfa72eaff SHA-1: 762343b3f06147b279d826e8f5e391938d4a434f SHA-256: 899bdc3b3762bcf48748bc90c0ac20074e3d4426b3fb09eeaa34b860b45adcd3
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URL likely leads to a malicious site designed to exploit the user. No scripts were extracted from this sample, but the presence of the external URI is a strong indicator of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=can+earthquake+magnitude+be+negative
    • https://cdn-cms.f-static.net/uploads/4469350/normal_5fb4d7a15f270.pdf
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fa81e0c5d8e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fowikorejodi/texturas_dibujo_arquitectonico.pdf
    • https://uploads.strikinglycdn.com/files/1262afc1-42bc-4924-8dea-38e7bfa9c9e0/33382389026.pdf
    • https://s3.amazonaws.com/bivanud/shipwrecks_lembongan_surf_report.pdf
    • https://s3.amazonaws.com/gulapore/84492770717.pdf
    • https://s3.amazonaws.com/wikurixobelu/rakoseb.pdf
    • https://s3.amazonaws.com/pisedij/best_anti_spyware_for_android_phone.pdf
    • https://s3.amazonaws.com/gupuso/notojifowew.pdf
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fc1163161e25426e15e6f94/1606489650608/vepilesodibafijakarazosam.pdf
    • https://static1.squarespace.com/static/5fc350c32e537a05ef18a0f9/t/5fca373387b36f46d40a25f8/1607087926910/nipikovojijor.pdf
    • https://s3.amazonaws.com/zirojopemup/electrical_engineering_mcq_books_free_download.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ff3f81c9a2a0c99c5b4/1606377460219/lififutexenifukepuvadiz.pdf
    • https://s3.amazonaws.com/doxifuba/73940483191.pdf
    • https://static1.squarespace.com/static/5fc0e006a879396864083677/t/5fc1e521e18c5c478e406ac4/1606542625586/solep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c311.bin
961f267aae1cb397680c38b7195045d1bcb4cf3daae081642ade0358a625a1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 5216 bytes
font_01_sfnt_off0000d497.bin
b0f5d2b73aeafcf4efe5f512fa2e9f60a87cf24a99919d91e6fc3fec82d621d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 10192 bytes
font_02_sfnt_off0000f74f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 4324 bytes