Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f0e09f8f8d6c66…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 00:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 648eb080e9792f60be4a9c44b5c93e55 SHA-1: aa92a6dac3362e92a53f69cf1709485dad18847f SHA-256: c8f0e09f8f8d6c66609c12083cfc215c725f6a9195f07b1a838e7fab9facfb79
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and external URIs, indicating an attempt to download and execute a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=antivirus+for+android+apk PDF link annotation
    • http://lavalnerina.com/userfiles/file/xejasen.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/bepoguja.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93084453765.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/dugotozidijowimozu.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/mavizokegetimojotefuv.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210902192511650.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109101301228987.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/suvewimuzif.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/bizimupufogexizesabuporif.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/96508088993.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/rikuludubivosolilefilo.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/jubarimixovu.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109020752121167.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/jinebokirulogulip.pdfIn PDF document text
    • http://hoachattn.com/image/files/7442978132.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/rijisojonazix.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd0a892ef---jaxinesesi.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/redutubipelifufirito.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/76217640865.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/kivisujapidefirumul.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161366e436ae98---29628608788.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/72087019101.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/81148229093.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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 17916 bytes
SHA-256: 0b5b34b58a5dcbdfe998476d37c9564db4459f6586dc9e1a4aee4898565c5998
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 10552 bytes
SHA-256: 5dff25bb5eb5024f002c3be9aec5712312064912123b5937083d3371920668e0