Malicious PDF — malware analysis report

Static analysis result for SHA-256 4748fbd4a16e922b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 19:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a274e8743ec9df9db5195af46926f2d SHA-1: 806a886ebfe86ebaa29169b28054aff40e86c855 SHA-256: 4748fbd4a16e922b29dc7e3abd95c40114aacbfcbe0dd06d1570ac4e303d6311
150 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, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=morfo+for+android PDF link annotation
    • http://tlw.ro/UserFiles/file/verida.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/setosejigovibomavirada.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/titotubimibemova.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/11862803686.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/49089649780.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/6191829819.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b9ee204e---nisidozapenas.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/36193999472.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/68452377598.pdfIn PDF document text
    • http://yjccnc.com/upload/files/40904203837.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/jusamavawul.pdfIn PDF document text
    • https://artenika.pl/fck/file/49081743696.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/sekodidomakifefubelufawed.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/fevunimavizakinabiruketur.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f183942666---gadolirojifo.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/79185250524.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/nulojusepiza.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/21094181512.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/83616964041.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/99404997282.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/22003552118.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_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 9896 bytes
SHA-256: 0eee4a709e7daab7405acc1addef8af77f8d023d08d0204f8edbc709e3a4ccf4
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 18368 bytes
SHA-256: 409714c6aaeac85f1d81997b962046b9d0131baed8d539ad840e05edd3a35030
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1