Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01cd0d26b684d63…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 17:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 471b646eae2e2964d0f76c00d5f77922 SHA-1: a1a6c349faef4d410176c66aa07b32e71facc698 SHA-256: d01cd0d26b684d637f23237b30ae7120eea3f01589c50f87b8bb6cb7fb28416f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=what%27s+the+best+navigation+app+for+android
    • http://shipagents.nl/uploadfiles/file/rujimixumavigifoku.pdf
    • http://safiorida.nl/operatori/userfiles/file/bunuferefeveva.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/fisepaje.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135045c3e799---pukopaponidivafeti.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/5232482105.pdf
    • http://obkladacstvikolar.com/content/77858628437.pdf
    • http://oldmotorsclub.com/files/file/8300201145.pdf
    • https://digireg.gr/upload/pujofaviwolib.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/58576569063.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/94429089144.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/205302800.pdf
    • http://malagi.pl/user-files/fck/file/29405958266.pdf
    • http://heydarbaba.org/resimler/files/48433992532.pdf
    • http://nousgarage.com/userfiles/file/83961175637.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/migasiwojewuma.pdf
    • https://slezanie.eu/userfiles/file/35410465002.pdf
    • http://konberdbio.com/upload/files/1321440881.pdf
    • http://finalstage.biz/js/upload/files/godalegavabupibojumoputi.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/75958925276.pdf
    • http://fskyok.com/uploadfile/files/48032750414.pdf
    • https://cottonweb.net/userfiles/file/13104656454.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/ralubefikotebefabene.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/13316036500.pdf
    • https://zahrek.com/userfiles/file/25415426422.pdf
    • http://albertf.madteam.net/ckfinder/userfiles/files/vanipofaran.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://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_off0000b086.bin
47ed2b52e5c9aaafeb8bf6e1b66d5b9d65e11cf5299d5220e40e5f2688ef4457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB086 15280 bytes
font_01_sfnt_off0000d715.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16792 bytes
font_02_sfnt_off0000ef2c.bin
340907a0711ce686f9faa665b8304d6c930ba766ed8db364b5e8cfda57df998f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 10964 bytes

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