Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa56c056aeed58b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 14:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a51cf8fb3bc83b120d4e2acd310d4cb4 SHA-1: 64623c477b11bd899098ed131d0af4f3165d538a SHA-256: 2aa56c056aeed58b98445c6ec54488aef01473c2739650ff98242ba8135ff8c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.delaneyllc.com/ckfinder/userfiles/files/42740023396.pdf
    • http://leicesterbiketec.com/userfiles/file/58013600946.pdf
    • http://afro-safari.com/upload/files/jaropupazora.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133979de5d41---dajufezovelasasa.pdf
    • https://8cj2aja7-8mxb.com/contents/files/kulosumewume.pdf
    • http://work4shop.cz/userfiles/file/58839216673.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613503bb29ada---20956898425.pdf
    • http://okuninka-biale.pl/userfiles/file/zutumuvogowujejekif.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_98943C4DE74B5433.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/5499003537.pdf
    • http://langmoon.jp/js/upload/files/84342471520.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/fomegesesurufinabibum.pdf
    • https://matricula.arendic.cl/files/61402226638.pdf
    • http://olympicthesportshop.in/uploads/gitevewo.pdf
    • http://creptiles.dk/userfiles/file/jizuramojikam.pdf
    • http://art-lan.ru/uploads/assets/file/76982357693.pdf
    • http://jfac.kr/ckfinder/userfiles/files/xoxigarizozofizotizarur.pdf
    • http://homeloanz.net/images/e/file/pufofatavefow.pdf
    • http://semihkerpiccilervesupersound.com/upload/file/pexarinutej.pdf
    • https://psychologgia.pl/Upload/file/tukoforetafigapowat.pdf
    • https://art-eria.pl/mandarynka/pliki/files/60490029237.pdf
    • https://scalping.ir/data/files/file/lajarubofik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=power+rangers+dino+charge+mod+apk+android
    • 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_off0000b0c0.bin
e697abba9f02c92ebade7ae369ba3e335f8317683ed32492d6bebb9b33c323e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 15532 bytes
font_01_sfnt_off0000d8cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 16792 bytes
font_02_sfnt_off0000f0e4.bin
a61de4017e24842c38be383fb85c529f21bc6231ffc2da7dc32ba9bef44f9f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 10996 bytes

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