Malicious PDF — malware analysis report

Static analysis result for SHA-256 0352bb4647907f50…

MALICIOUS

PDF

76.0 KB Created: 2021-05-21 19:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd6128c81dbc71c07c8bbe03f8f6db17 SHA-1: 2f91ebef2d4a72832d70546aaf9288b114a5b934 SHA-256: 0352bb4647907f50273f2bf8390683fa22fff6fffe102d6c6556cd84bbdc0228
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious URL, which is likely used to deliver the malicious content. The document body, though heavily obfuscated, suggests a lure related to downloading essays, further supporting a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+best+american+essays+2019+pdf+download
    • https://static.s123-cdn-static.com/uploads/4422145/normal_6003529ce01c3.pdf
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fc8bfb106ff8.pdf
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5fe6512233d3a.pdf
    • https://cdn-cms.f-static.net/uploads/4489724/normal_601b42e2bf17c.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_600aeb9365e69.pdf
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5ff963496b4ec.pdf
    • https://cdn-cms.f-static.net/uploads/4454971/normal_605fe674435b9.pdf
    • https://cdn-cms.f-static.net/uploads/4418746/normal_6041af73650a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jupoti/ps_vita_emulator_android_download.pdf
    • https://uploads.strikinglycdn.com/files/c09c972f-b681-4730-8c8a-77154e280e57/realtek_hd_audio_manager_windows_7_64_bit_free_download.pdf
    • https://uploads.strikinglycdn.com/files/ba7773f8-bd54-4e06-9600-be0783f7541d/2004_ford_f250_diesel_engine_diagram.pdf
    • https://s3.amazonaws.com/baxekojojexusol/worship_songs_audio.pdf
    • https://uploads.strikinglycdn.com/files/fa2f715f-1857-4acc-b305-12b4ae887e7e/godawapedu.pdf
    • https://uploads.strikinglycdn.com/files/02266b28-1db5-4305-9026-0a13cb6eda52/acido_fosforico_formula_di_struttura.pdf
    • https://uploads.strikinglycdn.com/files/dc9a0388-700a-48c9-aab3-cc782a398bf8/65908579060.pdf
    • https://s3.amazonaws.com/resixexi/ruud_40_gallon_power_vent_gas_water_heater.pdf
    • https://s3.amazonaws.com/wexukufedepim/php_foreach_html_template.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_off0000e8d8.bin
567ef44c708eec59a6c10a29996d81dfa323379c2e836a599fb6555e44a89f3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 6160 bytes
font_01_sfnt_off0000fdbd.bin
284acd3377a57f9cd2cd4ec5f023a79dd9e2a0abc9749ca87be637e6dca336d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10368 bytes