Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e635d0900d34a…

MALICIOUS

PDF

98.3 KB Created: 2021-03-16 02:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 21dbf26103c7a5967aa20c4b55299989 SHA-1: 371f32cc85e88a87bd46ef7b0d3862b51aac2be8 SHA-256: 4b8e635d0900d34a999bb47b232ed393e5968b7a697b16f995ae02bd613271c2
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to host malicious content or redirect users to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a manual, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/wix?keyword=manual+apm+2.8+portugues PDF link annotation
    • http://trastqort.online/43857639637ow9r5.pdfIn PDF document text
    • http://coloradocustomelectric.com/can_you_take_your_motorcycle_permit_test_online_in_nykzyhs.pdfIn PDF document text
    • http://santand-es.com/871444506ygyj5.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/fezivilor.pdfIn PDF document text
    • http://silofabinewu.22web.org/39700162619.pdfIn PDF document text
    • http://judugasolunived.22web.org/systems_of_equations_word_problems_worksheet_algebra_1.pdfIn PDF document text
    • http://kezekimoridim.22web.org/54235956538.pdfIn PDF document text
    • https://wepujemu.weebly.com/uploads/1/3/1/4/131453456/vanuk-datilemik-mijup-xawebaba.pdfIn PDF document text
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/kukozejoge.pdfIn PDF document text
    • http://mnclassis.org/assistant_social_welfare_officer_paper21z5n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilidax.epizy.com/what_ch_is_newsmax_on_optimum.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/69871433112.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_1d6efdd9dbb34e4b8c2ac920edd5a876.pdf?index=trueIn PDF document text
    • http://nojodesara.epizy.com/gopunemavu.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/24222656176.pdfIn PDF document text
    • http://sojizodujibibo.epizy.com/97954534779.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_34d2f69b8d3b439eb4af7036782b931b.pdf?index=trueIn PDF document text
    • http://gixopefujunop.rf.gd/mexewimug.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/movies_hollywood_hd.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_4915bac07a2c4154b0fec62295b3af97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/bumaposexutetomisipi.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/bupobuzilemarew.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_a4f529b4068346dba1c904e887e4cd74.pdf?index=trueIn 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_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 5504 bytes
SHA-256: 0a983383f54a57b450365697339031319f0f960b7e13ba43131218af602657c6
font_01_sfnt_off00015137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15137 12352 bytes
SHA-256: c74a06412cc109f3994d37f40217ffbc2760605cc820e8f08ef69712d486d95e

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