Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4aac369b66673df…

MALICIOUS

PDF

83.1 KB Created: 2021-04-02 15:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5401cfd1ffb982736f2da87c34d5c03 SHA-1: 5c65e500586ee6c0a32639c543ae409521a3e5f8 SHA-256: f4aac369b66673df19b556c3369740ef2d965dc2246110e42cd419d90fa45c8b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains elements that may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=elite+bilingualism+pdf
    • http://studyweb.site/chiru_gang_leader_songs_freebfuq5.pdf
    • http://mitsumoro.ru/meade_114eq-dh4_4.5_equatorial_starfinder_reflecting_telescope0im62.pdf
    • http://vubitim.sportsontheweb.net/multivariate_student_t_distribution.pdf
    • http://sigorododosub.iblogger.org/78240096675.pdf
    • http://insurancecarusa.com/27778979095yhkda.pdf
    • http://hyipinvest.site/what_does_color_constancy_refer_to6qhiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kixiwuru.epizy.com/83009229983.pdf
    • http://fokodema.epizy.com/uniform_distribution_science_definition.pdf
    • http://murapimopavopa.myartsonline.com/wibimerete.pdf
    • https://s3.amazonaws.com/xarojapi/ilive_47_inch_detachable_bluetooth_soundbar_itb474b.pdf
    • https://s3.amazonaws.com/bivanud/annamalai_university_dde_prospectus_2017-_18.pdf
    • https://s3.amazonaws.com/xuzakob/61211559665.pdf
    • http://wepogevadapafa.atwebpages.com/pikeb.pdf
    • https://uploads.strikinglycdn.com/files/5ba09e77-349f-4aa3-9b0f-bffbdf70b1e8/lawaxageriboterajatu.pdf
    • https://uploads.strikinglycdn.com/files/24a1035a-3eda-4ad6-88c9-d8543c1136de/nivatanav.pdf
    • https://uploads.strikinglycdn.com/files/adbfde41-9192-4dd5-8dac-996d49674dab/schlage_keyless_door_lock_manual.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/ringtones_love_song.pdf
    • http://porumujowupof.epizy.com/how_to_work_afterglow_headset_ps4.pdf
    • http://zixaxonenugoko.epizy.com/rapidex_english_speaking_free.pdf
    • https://uploads.strikinglycdn.com/files/5c7c845f-f095-4f18-8ebe-ca2a1fa9be46/45891827590.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_off0001084a.bin
a6114f4f489551c6cad41e975f6c0272e89309606bd216cd951ac01fe97131dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 5360 bytes
font_01_sfnt_off00011a7a.bin
3f701af8b1997f0c0551c96d1cf3b39c6406e043ac1a003a9267188ac2dfdf49
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10864 bytes