Malicious PDF — malware analysis report

Static analysis result for SHA-256 9100fd5e572a2308…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2a2718dfdf57d2f92ce6ac70eb374c7 SHA-1: 53b20743c6cb7878f6212081f2c3937014197175 SHA-256: 9100fd5e572a23086c77124e35c1240edc7064d2f1a4afb6a0820a172b0594bc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kpghomerepairs.com/uploads/image/files/60057981250.pdf In PDF document text
    • http://119pump.net/d/files/30893779333.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/jadumenodagaxav.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/70435648094.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/nomomijujavorom.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/17919235902.pdfIn PDF document text
    • http://metallpress.info/files/xonelojidu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/89975855074.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/runuv.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210904_015302_5720.pdfIn PDF document text
    • http://zubrcup.by/files/files/dililejijekerebijuvovu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d48c5d655---86621052827.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/81239317576.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52050494673.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff3d73695---71606127714.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pevonubetomide.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/11899434267.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/purituxomubukubulopali.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/92652227792.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/dosogamazivob.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/78302014968.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/wexajajapivitekexokajal.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/dopabix.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/lesuxeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+best+free+online+movie+sitesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 10488 bytes
SHA-256: 2bb7401cf73663b1f3036bb1838f66b92c7eb5c766ab212fecbe5ac0040cf9c2
font_01_sfnt_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 16328 bytes
SHA-256: 1ce419c371d86d1f6fa05ec3d04dd7f0d8ea12d899e3035bd13b6ad84e63a438
font_02_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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