Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbb60f4e357dc11…

MALICIOUS

PDF

74.9 KB Created: 2021-02-22 02:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fec8c9f5d9bc3d8f17c88899d528e828 SHA-1: 4621b78247e1e88da5e34a870271b1b350f33b46 SHA-256: 8bbb60f4e357dc11df3ad7c00406216f99e52b291aa8a4fd6c0e9d8078073133
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 a specific detection name indicating it's a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=prentice+hall+algebra+1+online+textbook+pdf
    • http://kuwanusefunok.iblogger.org/google_drive_folder_python.pdf
    • http://vidapabil.22web.org/sexevezoba.pdf
    • http://vittorguxx.site/microeconomics_mcconnell86jvs.pdf
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/7829b4324c4ba7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://demezokesude.rf.gd/97317580149.pdf
    • http://finubebaguj.rf.gd/hallelujah_chorus_tonic_solfa.pdf
    • https://s3.amazonaws.com/sowewazulejewi/happy_birthday_in_korean_song.pdf
    • https://s3.amazonaws.com/likerajatob/wunujujen.pdf
    • https://s3.amazonaws.com/fajetufekejo/36698368347.pdf
    • https://s3.amazonaws.com/muvemasoxaji/google_play_store_apps_apk.pdf
    • https://s3.amazonaws.com/rumezo/labour_law_guide_contract_of_employment.pdf
    • http://taxonan.rf.gd/68361943760.pdf
    • https://s3.amazonaws.com/fasudikek/varufigodafogizosizesuru.pdf
    • http://vezoxonu.epizy.com/pekerozatizivitipewufad.pdf
    • http://rexenejo.epizy.com/bd_air_force_job_circular_2019.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_off0000db4d.bin
f8124162002f78fa73bd0ca63eb66e05890ec7cfcf1e1543cb0b040baee0a66d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 5352 bytes
font_01_sfnt_off0000ed6f.bin
07e732133309ea4a2fd4539ba20126c4d7457036d4d33825ed6a4f9e20957b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10196 bytes
font_02_sfnt_off00011047.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 4324 bytes

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