Malicious PDF — malware analysis report

Static analysis result for SHA-256 3178d2e1c4faafca…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 18:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d133fdadf22b1c7cd45fd8270687d9c9 SHA-1: 1d8804f0298049f405bb6ad4234ff5a9f111037d SHA-256: 3178d2e1c4faafca3ec07ef37e688a5573119c32eb8214f3fae1046e1799dbfb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jv-cms.crazy-jessie.nl/uploads/files/zufafofapidave.pdf In PDF document text
    • http://gpsputhuppally.com/userfiles/file/repabefo.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/94133291379.pdfIn PDF document text
    • http://vhktn.at/images/content/files/73048877068.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131039fa7fef---govivaborizegovudon.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kimesujijasurolarowo.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/42022786337.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xeropazitadefajinex.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73ca68d5---10003391683.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/97412772010.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/riliximaburisukalefere.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/dakifakojabulepaxemub.pdfIn PDF document text
    • http://rilta.net/userfiles/files/69610579782.pdfIn PDF document text
    • https://felicityokolo.com/file/lafamojubisasu.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nepewurinowo.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/petameresadowokuseju.pdfIn PDF document text
    • http://skncn.com/u/files/98557899161.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/3197947673.pdfIn PDF document text
    • https://fultoys.com/userfiles/wumolasimuzizebilosatopi.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7508084000.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/zexovefobaduvijowukeg.pdfIn PDF document text
    • http://onelove.cz/file/87860690961.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/gevewelidoxodajel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=signal+not+found+11+pokemon+goPDF 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 18648 bytes
SHA-256: f57254bfcf9a4187ace904292f13ab1971000b92148fb13250a2ee82e5d2422f
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10892 bytes
SHA-256: 58e944847ff09d4bab40e6df8f7efad5db5428f02768e8e3d6393cc348f6d2f9

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