Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d0d996630dd042…

MALICIOUS

PDF

161.0 KB Created: 2021-03-24 03:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5307efbd41a8919dc6135be3c6f5680f SHA-1: 75843efa8d1bfec32f5c13dcb46bae5bb9b64fd4 SHA-256: c4d0d996630dd0423c49e3d84d752a051b2110aac915875ecccf66f8129400ef
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though heavily obfuscated, suggests a lure related to 'change management pdf case study'. The primary malicious indicator is the external URI pointing to 'druttle.ru', likely serving a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://druttle.ru/award?keyword=change+management+pdf+case+study
    • http://mebotus.mypressonline.com/15680510974.pdf
    • http://qrastenmap.online/61786863566pytss.pdf
    • http://pekibule.iblogger.org/39403659596.pdf
    • http://thedopemarketing.com/zudazegodefositi54gao.pdf
    • http://lovupijuti.getenjoyment.net/characteristics_of_metals_and_non_metals.pdf
    • http://redit.fun/lexevozutivinebugitqgmhi.pdf
    • http://graatorama.space/shawlands_primary_school_inspection_reportt45wa.pdf
    • http://jusapp.club/jubeledekb3a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/saziwijaxodav/mewogalelezisok.pdf
    • https://s3.amazonaws.com/xeropizuwe/3_phase_transformer_current_calculation.pdf
    • http://lusiromipu.epizy.com/paleontology_geology_notes.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_03828ee793be47b2b42d8baed6955b11.pdf?index=true
    • https://s3.amazonaws.com/resixexi/price_volume_analysis_trading.pdf
    • https://s3.amazonaws.com/gadumagabusodel/bafg_zusatzblatt_zu_formblatt_1.pdf
    • https://s3.amazonaws.com/rupatojuko/52347662494.pdf
    • https://s3.amazonaws.com/najubu/25882127604.pdf
    • http://vomifavub.epizy.com/57026740307.pdf
    • https://s3.amazonaws.com/robumuduluwise/3rd_shift_jobs_near_me_no_experience.pdf
    • http://dugupafado.epizy.com/gallstone_formation_process.pdf
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_9470b204f81c4d41888e69534b191095.pdf?index=true
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_5f2a7363a46448f095342fc5a5b91a90.pdf?index=true
    • https://s3.amazonaws.com/kuboki/majigapetesoxozuborupegu.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_off00023ab2.bin
5710fabd9ff2c721f4220a58949c0fcfef6ca5cdde8acc6998f43d77ba8060b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x23AB2 5448 bytes
font_01_sfnt_off00024d25.bin
8fab731c1cc9a1b774bc75fa526ea95a7363ed47773a979b5af7c2ad9e967bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x24D25 11896 bytes