Malicious PDF — malware analysis report

Static analysis result for SHA-256 38015fc5e0939caa…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 02:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69c5ed16ef2227dc8c2411e0b787b51d SHA-1: d6158f73f51a6267472c4ad76ee6f674b67be5cc SHA-256: 38015fc5e0939caaf8142d67ddbfe9692b4183d9c19d10d7a6146c4d84313e9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, strongly indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection confirm its malicious nature. The presence of JavaScript suggests an attempt to exploit vulnerabilities or download additional payloads, aligning with common phishing tactics.

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://chcial.ru/uplcv?utm_term=smart+launcher+pro+chomikuj PDF link annotation
    • http://tianfonmm.com/d/files/biwixunumonupupemuxugur.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/totobilukuvemopavovax.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfaf0301b---64836404382.pdfIn PDF document text
    • https://kimcert.net/E/file/85420942265.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/fabetevozazenukewug.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/wakozafiwo.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/naxikeperesinelirupa.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/73797405638.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/56578731057.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/kemisavufekuzesudamoziga.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/83384514748.pdfIn PDF document text
    • https://faceless.me/userfiles/files/85194063404.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/volalisunufikivimevibak.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/xinozapow.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/xozojepib.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/47115168457.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/423888120.pdfIn PDF document text
    • https://wrd13.com/force/file/wirusadozaja.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/babiguvagiz.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/noxug.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/82894964179.pdfIn PDF document text
    • http://bienbao.org/uploads/files/29983786344.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/24586597809.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8d4b6866a8d0cfa3066fc39c5d9b/wotutexolirogolugo.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/wokosawivezolaloramo.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_off0000c2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 10868 bytes
SHA-256: 4e20edbe7bc910683f082e4e742518c27d99ed9827f95b2b8fcb5314820a457f
font_02_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 19816 bytes
SHA-256: 504e8b8b9a8c9275e9281e9e8f528b822d48e6778948be32e429da2a17bd8486