Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c38686c0506bbb…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 02:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20043554eb5518317bc06d0a7b36aa92 SHA-1: 32e045f7d01fe010fd0bb11bc777f2c7286832f8 SHA-256: c0c38686c0506bbb38303c08526a426af364a7595cb98f97c20540009d5af3f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ncfc.com.tr/ckfinder/userfiles/files/37523138405.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/moref.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/15706795824.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161441673745b9---mozovubawu.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/73879223402.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/birasavaniletebepek.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/95494555143.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/ponilax.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/robirap.pdfIn PDF document text
    • http://dakov.hu/_user/file/malolanikive.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/71289047399.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/49756765323.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614644a24e450.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/pafujiligoka.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/mozefamusupeveno.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tiviziwuzilegutog.pdfIn PDF document text
    • http://besteva.com/upload/files/23278800355.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/kebigikikexiwu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_BAF3ED8AB9FD18F6.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/nurikikiw.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/feponunisogalapu.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/29893011220.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/79584908209.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/jidurofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=8086+assembly+language+programs+examples+pdfPDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 11508 bytes
SHA-256: 6ea4eb977e86fc96900da71636860f6f6c099a509e8bb36ccfc451646ddcea25
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 18568 bytes
SHA-256: 00308c6844b6cb35b2775796e6712917c4de34d13a94b78aff6bd277b41736a8