Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9ed521610b5ef6…

MALICIOUS

PDF

91.4 KB Created: 2021-03-25 09:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c803551397ce5a313f86118e75bd52b6 SHA-1: bf70d22904d43299e8b392db53475d1e83095026 SHA-256: 5c9ed521610b5ef63749ffd8490d190265a56e3adec54f6a4e5eba3a3e35c3e6
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://xajibur.ru/strik?utm_term=power+point+sistema+muscular+cuerpo+humano', which is likely a lure to download a secondary payload. The document body, though heavily obfuscated, suggests a deceptive presentation related to human anatomy, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=power+point+sistema+muscular+cuerpo+humano PDF link annotation
    • http://unityfree.xyz/tugamivegiyj1eo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_602a2c8b801d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_6011a29484423.pdfIn PDF document text
    • http://lordtrans.ru/craftsman_front_tine_tiller_repair_manualz0h51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_5fe6bf7d2eb5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_5feeb87ec63c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_602693c41090e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec3a5f8-99c4-405d-817e-595ff0a8c5d8/where_to_buy_graco_pack_and_play_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/chikati_gadilo_chitha_kotudu_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60927d6-9f9f-469d-ba1a-fe789acc7ad6/what_are_the_primary_tools_of_fiscal_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/how_to_value_mutual_funds_on_date_of_death.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_be0d7134762748fb91da1de57a521d53.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_d7fc76ec5e7848ab8fd03824a7084118.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/jelorilisave.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/aarti_name_ringtone_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e063b8-8e68-42ea-996f-f61736eca618/60661829493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a7e650-e475-4cb9-8b2e-a0918fe28a7c/my_cloud_wd_software_download.pdfIn PDF document text
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_25eacccceca841769aab6efcf65d6c33.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_b101642c45bd494b940540df5be01d74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/how_will_the_new_moon_affect_aquarius.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 5264 bytes
SHA-256: ff374cad5a44262c6478cfd15440e9941fe1af71f7d0d9496fc7ef0914931cb2
font_01_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 12964 bytes
SHA-256: 62c8376db92de54997ef2847e321d08b79c4bc70b79f106f3e28ee37d9205cf9

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