Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cd65e627fc96e9…

MALICIOUS

PDF

73.8 KB Created: 2021-10-05 06:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b75d74c69444b619c85ab7ac38097f66 SHA-1: a320daa6035709400a1a245d109477d8e93b7d32 SHA-256: 16cd65e627fc96e969b135161ebb82cd5ed7f67a26c5351cd09676942203da64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JS points to T1059.007, and the nature of the document suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=discriminant+and+nature+of+roots PDF link annotation
    • http://ghinelliarchitettura.it/userfiles/files/24639426780.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/47409134395.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/famupepirozusepezop.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/jonudovamikimusixufaxene.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nilumopapiji.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/36341363821.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ded81f8f23613b5e2a1e924dd8f96290/75353170121.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/69865580838.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/diripuniwixivujezaxo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/vupupin.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/92909125586.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/vidakofuguxavakisedux.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/bologonokajijuvo.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kuduxupexaxumuxazux.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/70185346946.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/74113834323.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/62416926737.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/21619934589.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/67144531839.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/49329313855.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/werepesi.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/39305862020.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/jaxekegadokamanukutawupu.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_off0000bc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2B 10692 bytes
SHA-256: 3478bac426c3579b6def2b358c7e2c764638b4c4690920da970d3fc6d58734ed
font_01_sfnt_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17100 bytes
SHA-256: 2f90aed8cab0f09af1a2006b719e00906c1aeb3d9549f1600c6e86b8482321f0