Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b655201f03a688…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 18:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f21f43af4c384f14b84156fcb434ae SHA-1: 121a7c192208041988a1ae2742552c8cf7c5130d SHA-256: 74b655201f03a6888a5df66599cf2100f24ad7fc7bd55a54380bf31631fd84b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to PDF files on different domains, suggesting a link farm or distribution mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this being used for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://hoangminhphatkorea.com/webroot/img/files/93462755676.pdf
    • https://newcar-rental.com/uploads/files/202109140637048470.pdf
    • http://bolshunoff.ru/images/wysiwyg/file/talejiwonuvutoritem.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8e9dc57c---zegudafufeme.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdf
    • http://kerekesvillszer.hu/UserFiles/file/mesamabezo.pdf
    • http://sztarmedia.hu/_user/file/86163486789.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/finusabixodogeferejo.pdf
    • https://calendarsunrooms.com/userfiles/files/kisadi.pdf
    • http://naim.naparts.com/images/fck/file/42623314870.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fubawazalexo.pdf
    • http://beccaro.it/userfiles/files/lemovavikizudobotega.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/98655928183.pdf
    • http://wx-test.com/upload/ckimg/files/202109161027199644.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/gisikududinopikazaba.pdf
    • http://master-br.ru/img/file/winupajagojeg.pdf
    • http://gpszone.hu/upload/userfiles/file/72877484312.pdf
    • https://kermoulin.com/userfiles/file/meruzel.pdf
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/83183803534.pdf
    • http://www.slappedtogether.com/editoruploadfiles/file/nifuzofugajekuxosaza.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/lumibimanujadonofaku.pdf
    • https://pielinks.com/UserFiles/file/wifunug.pdf
    • https://ifbscalidad.eus/files/galeria/files/lafupad.pdf
    • http://llux.vn/uploads/files/fawafutepasojikot.pdf
    • https://taxforce.nl/userfiles/files/gogov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fake+gps+go+pro
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea61.bin
8c0d2553c7eab52531077b2c60f02539a78615e95358537532b63bda2e24d3ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10156 bytes
font_01_sfnt_off00010141.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16792 bytes
font_02_sfnt_off00011953.bin
cd4f151418d14ea62eed4d822c6efe21462663f4b4c76f8dd33a2089780e79fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 17912 bytes

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