Malicious PDF — malware analysis report

Static analysis result for SHA-256 1383e26ae7399f6f…

MALICIOUS

PDF

89.7 KB Created: 2021-03-24 16:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2dc6f6bd07ae0022a8d0a8240601e3e6 SHA-1: e1cb45bdaa40950eb5e94a40b00cf0b36baf2698 SHA-256: 1383e26ae7399f6f9ab42c3323ec4c78719087c7c4e8ac6f591548188e2ea9b1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'vilenefex.ru', which is likely a malicious domain used for distributing malware. The presence of a 'download button' heuristic further suggests a social engineering lure to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=draw+for+dummies+free+download+x7 PDF link annotation
    • http://exemplpusj.com/papunevedegemezewzlksu.pdfIn PDF document text
    • http://esagafow.fun/hospital_management_system_project_report_in_cllwyb.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/bjbgche/kibuxuwinewumujamaxam.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/mgiFvhQ/sexubage.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/jjehbhJ/mazisekonufusotufokelorax.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/79483243916.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/b9f59dff-ffeb-43bf-ad49-05cf6c7d63a7/nefejoxuradevuvexeroman.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/viburuzapisepeweni.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/sipaj.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/mobile_software_updater._exe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178f515d-4414-47ef-b68a-9a66098989e4/gorutipokikeb.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/1556416668.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/dajonezilowam.pdfIn PDF document text
    • http://birofasadonu.epizy.com/15520647629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3bcb3a-d414-47cf-b688-54c6f6f6f06a/is_ssa_1099_considered_income.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/lagu_cinta_karena_cinta_by_judika.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/zuxejagitoxejuparer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 3060 bytes
SHA-256: 65fd02435f7462e45bfa30b64f8e20d6fc1e2184e2b10fb5466ceffc892e2f00
font_01_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 5292 bytes
SHA-256: 72c90022341a8e222f30d8edf6bd53511d40e14301e35ce823ab5e00f6b5788f
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 14668 bytes
SHA-256: 85fd2aeaf272e80109805735af3e153808ec0405a88065036a5bee9daa555a25

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