Malicious PDF — malware analysis report

Static analysis result for SHA-256 220f45858aa2f6f4…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 00:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fbef5da5e137ed4a8774a6015215d6f SHA-1: e14792138922b9b30172689b1fe395fa1dcd6858 SHA-256: 220f45858aa2f6f45f3bc5c0d24f54cf0bed53724788755e4a724d5b95e66eb7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-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://zajinet.ru/award?keyword=auditoria+em+sa%25C3%25BAde+pdf
    • https://cdn.sqhk.co/ganuniwiku/fhghfib/gnomes_garden_nintendo_switch.pdf
    • https://cdn.sqhk.co/niramojiga/DliDijp/piwejuven.pdf
    • https://cdn.sqhk.co/womafafowix/hhjicY3/accountant_job_interview_questions.pdf
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/b865b1f6b78c40c.pdf
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/abb03caf2ce9b9a.pdf
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/8372740.pdf
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/5bb14d6606cf.pdf
    • https://vaxujorukub.weebly.com/uploads/1/3/1/0/131070318/80dfe9dca.pdf
    • https://tunuzari.weebly.com/uploads/1/3/4/3/134316111/godisakeleb.pdf
    • https://larikizog.weebly.com/uploads/1/3/1/0/131071312/sijezas-bisak.pdf
    • https://zetidazuxoni.weebly.com/uploads/1/3/4/3/134307137/sebat.pdf
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/jagefari.pdf
    • https://dufurewamefo.weebly.com/uploads/1/3/4/5/134595550/kimelarurenek.pdf
    • https://cdn.sqhk.co/junizafuzep/cxheqgh/rajajulagubedifigotikifo.pdf
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/6801019.pdf
    • https://cdn.sqhk.co/duloputemab/Kk8hghh/aquapark_io_mod_apk_rexdl.pdf
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/2594212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kaxukok/15894547522.pdf
    • https://s3.amazonaws.com/xalexojaxipud/50707334619.pdf
    • https://s3.amazonaws.com/zuguvoxoki/academy_of_management_and_information_technology_odisha.pdf
    • https://s3.amazonaws.com/woxotopapozokev/complete_urine_analysis_test_report.pdf
    • https://s3.amazonaws.com/metakibeme/44102467339.pdf
    • https://s3.amazonaws.com/pisedij/mimaduxirufipukolipa.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/crackle_apk_para_pc.pdf
    • https://s3.amazonaws.com/fakuguvil/malayalam_kambi_kathakal_app_free.pdf
    • https://s3.amazonaws.com/satuja/57830604060.pdf
    • https://s3.amazonaws.com/lekelepowo/76960593723.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_off00010069.bin
dc7a8b8907e3490c2befbf7aa4e9902c9af43fbbacb9cb4dcb70714b9b808a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 5260 bytes
font_01_sfnt_off00011200.bin
957d3d1120078e7b62f31e36edc7ea0427ca03f3d03f6e51a0b0dea03a12c5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 13304 bytes

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