Malicious PDF — malware analysis report

Static analysis result for SHA-256 d325c5e5dac62768…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 11:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034fb970108012bffad630cca07bd974 SHA-1: b6752df9a688f3d21d9a15d595bc947644b61ea6 SHA-256: d325c5e5dac6276844e909c2c17761d82832c97a0cc2f19f513c53027003b159
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'nipisod.ru' which appears to be part of a lure to download a PDF. The document body is heavily obfuscated, preventing a clear understanding of its specific payload or intent beyond the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=photo+reading+book+free+download+pdf
    • https://cdn.sqhk.co/kekagate/Bhd2wT8/k12_jobs_online.pdf
    • http://sehq.xyz/lelamaji2ku5s.pdf
    • https://cdn.sqhk.co/wosepimi/hidjcjd/84618504791.pdf
    • https://cdn.sqhk.co/kigowabalo/ljcTwgf/84973646329.pdf
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/b7bf6cc46f67.pdf
    • https://cdn.sqhk.co/satofurijob/gCTgdgd/flip_master_cheats.pdf
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/buxatinonaka.pdf
    • https://cdn.sqhk.co/pogezasamu/PjhZigR/fios_tv_app_apple_tv.pdf
    • https://cdn.sqhk.co/jugokake/wihp5ia/moninoril.pdf
    • http://energierecrute-emplois.com/80194025972nly16.pdf
    • https://cdn.sqhk.co/pulafefer/heja2H9/sad_ringtone_audio.pdf
    • http://arboozfilm.com/4099588889qqr2i.pdf
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/vapugebo_radoj.pdf
    • http://xbet1.fun/advantages_and_disadvantages_of_communismbuduz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_a20ddc5fee6a4471814a4a6668a3c9ea.pdf?index=true
    • http://puliwoxijulu.rf.gd/why_does_my_sims_4_keep_crashing_november_2020.pdf
    • http://lunokaruridonal.rf.gd/what_is_ezgo_pds.pdf
    • http://jejivosijej.rf.gd/zaruxafejotubepixuvu.pdf
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_aacd9825a0194518aaf8ec1ed47706e6.pdf?index=true
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_2b3214dfd8064cdea2a4703cf0bf8d08.pdf?index=true
    • http://kanosejimu.rf.gd/pixixeviwekefosuzusetenim.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_ee74866a401349988dee6574762213f1.pdf?index=true
    • http://dabirojab.rf.gd/metal_fabrication_a_practical_guide.pdf
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_9da5ea265a23481ca7b89c6279634b9a.pdf?index=true
    • 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_off0000f0c2.bin
d3541be1759a093208b578d9d42527ac48839554e5465cca88f89621723d5bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 5420 bytes
font_01_sfnt_off0001033d.bin
ab19e778ef3191cd7bfa45bf22369f8b929c8c826ff5ab18aaa7314e57956eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 11372 bytes

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