Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e73e40972294b88…

MALICIOUS

PDF

215.8 KB Created: 2021-03-18 23:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84c054089de1dc66487326663b7c477 SHA-1: 1078ced27d86f5627e69201a1e45f89b4c45eee1 SHA-256: 4e73e40972294b884a76df47acc37d709d44f7b894275af48898c6a744e7f95c
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 attempt. The document body, though heavily obfuscated, suggests a lure related to 'Beej's guide to network programming'. The primary IOC is the external URI pointing to 'leonvi.ru', which likely hosts the malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://leonvi.ru/wix?keyword=beej%2527s+guide+to+network+programming+pdf
    • https://cdn.sqhk.co/lenufetimop/gjgcL6d/66698514745.pdf
    • https://cdn.sqhk.co/wepigosogo/7ohgjeZ/pijuvajozovaziluwuramip.pdf
    • http://benosetib.iblogger.org/kivabinorigusavomi.pdf
    • https://cdn.sqhk.co/jukunobegabe/jhjPTXG/alan_walker_lily_music_mp3_download.pdf
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/midizu.pdf
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/peluxunutuwozikuxi.pdf
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/gobozim_gulubefovufu_jixijewadifek.pdf
    • http://wuwodijutorem.iblogger.org/wixuzulavopilofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bepibuxel.epizy.com/grade_2_phonics_test.pdf
    • http://fewedafov.rf.gd/sleepwell_foam_sheet_for_sofa.pdf
    • http://sabolobu.epizy.com/27724249641.pdf
    • https://s3.amazonaws.com/suzujewa/bar_graph_android_example.pdf
    • http://fofogagad.epizy.com/2203583417.pdf
    • https://uploads.strikinglycdn.com/files/b6eec0fe-6482-42a0-9e5c-fc7dacc4cfd9/what_are_the_lowest_calorie_indian_dishes.pdf
    • http://tomunipi.rf.gd/46556872517.pdf
    • https://s3.amazonaws.com/pobixedele/calendario_campionato_serie_a_2018_19.pdf
    • http://zumepule.rf.gd/online_certificate_courses_in_computer_programming.pdf
    • https://uploads.strikinglycdn.com/files/aeddc421-b0a0-4322-99d2-449cc4bf1257/who_pays_for_deed_of_covenant.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_off00030080.bin
9aafc55e5ba2c8c7c89d20cef2636879bf7b3646c5bc7a78d649b2f92e490f79
pdf-font-stream PDF embedded font (sfnt) at offset 0x30080 3872 bytes
font_01_sfnt_off00030e42.bin
02fa676e523d919bd896e1a0fc176f3212fe64232d32338a99dc006d38283fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x30E42 5644 bytes
font_02_sfnt_off00032186.bin
a12943f34fbb6673862c1f939e8b56892511b35140850601b8cdc5a3e360caae
pdf-font-stream PDF embedded font (sfnt) at offset 0x32186 13132 bytes