Malicious PDF — malware analysis report

Static analysis result for SHA-256 436568188f6c997c…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 11:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3383400e90c0c9c38ea642b73b5ca176 SHA-1: 9634f73f0b7ef6666444b5dbfad0126d006b74cc SHA-256: 436568188f6c997c2aac0a33b3068cff57c2f8c08b4eaeecb837be8564e2b6f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or distribution network. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=computer+system+validation+training+in+mumbai
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/2753240.pdf
    • http://wirobigi.medianewsonline.com/bldc_motor_design_book.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/eafadc4db248711.pdf
    • http://kujinatazema.sportsontheweb.net/jusisotape.pdf
    • http://rexuwoxaga.sportsontheweb.net/mimojutotamele.pdf
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/4263542.pdf
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/gefubujude.pdf
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/limaxapamaven_gawudoniwo_wupekavizu.pdf
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/9998948.pdf
    • http://lololoj.sportsontheweb.net/sipoxumejemixabamozosifom.pdf
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/8c142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisegilupuf/schaums_outline_linear_algebra_solutions.pdf
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_e6b8cf249ddb45e4bc1e5c02f8f10810.pdf?index=true
    • https://s3.amazonaws.com/nuxulikiwab/daliboxasigavikepilamoju.pdf
    • https://s3.amazonaws.com/wukevirenesu/kuvijijepizagi.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_c68f91b393c647859147230f2b885468.pdf?index=true
    • https://s3.amazonaws.com/loneminovu/madinah_arabic_reader_book_1_answers.pdf
    • https://s3.amazonaws.com/jalasilunaz/95640894102.pdf
    • https://s3.amazonaws.com/jotizifime/child_video_songs_mp4_free.pdf
    • https://s3.amazonaws.com/rujimidujek/fabom.pdf
    • https://s3.amazonaws.com/kisimujuk/14220454413.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_off0000ebf5.bin
57c88af84dc6bc9cf509c6598022c78bb29f59eaf21599c83f1cd4a8478906e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5488 bytes
font_01_sfnt_off0000fe88.bin
4a8a64753f5d231d752b39fd6578f085edd1ecaf1f71c4157f548d6985def1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 11012 bytes

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