Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4651233091edef2…

MALICIOUS

PDF

88.2 KB Created: 2021-10-12 22:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6a6ab705ced326b2baece70ef80dc7b SHA-1: 4c5f66d1a53d43822eaed73b5a276fc79b6599de SHA-256: e4651233091edef20bee96ec8125354cc8551fecc4fbfee51f977da96d307080
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 point to disposable or potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or hosting malicious content. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=chicago+style+footnote+citation+example PDF link annotation
    • https://xyoaa.org/sites/default/files/files/xawuzaxoniziterasevawokor.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/05d216ea48fe54dfe88de0bff45df0ca/wisujiripalejitidupiku.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/73085191522.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/terojopifedewi.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/92288334050.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/20211011_231656_465.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20211008_FC828707BB2CA226.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/32852964902.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/41751704616.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/dopet.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mosewodoxuwuzitopopurowal.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/26733642829.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/95204725473.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vefuxufaladono.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/zizepi.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/30763912973.pdfIn PDF document text
    • http://indemo.pl/Image/files/49586200909.pdfIn PDF document text
    • http://polkovnik.su/upload/file/basovibir.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/24941783764.pdfIn PDF document text
    • https://protum.se/file/14897471384.pdfIn PDF document text
    • http://gdgom.com/upload/file/210924072244351202uylxg3nzukjc.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/digejitusuxoronedi.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/65893959080.pdfIn PDF document text
    • 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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 11072 bytes
SHA-256: 57d7f8b7b0530a061d4e333790b72f17c90c02a2b305941ec42aead58a03ad16
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 19656 bytes
SHA-256: 88ff1b6a744b749527f06acb086a722e8239027e9f76716bc1938bc75689bf04