Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae12b8ca5ce318e…

MALICIOUS

PDF

67.6 KB Created: 2021-09-30 21:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00c19c007e1a76141dff29829dbda87a SHA-1: e172839b64e73de036d0fc0b37288678795c204f SHA-256: 7ae12b8ca5ce318e706a3fddb4568fcc23aa8e5f18d8da3cfcc86e4d8c56ae49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is identified as a phishing lure due to its image-only nature and clickable action. The heuristic 'PDF_IMAGE_LURE' indicates it's a common shape for phishing where a screenshot hides a clickable button. The embedded JavaScript and numerous external URIs suggest an attempt to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bl4fgohn656obuqanvh9q13p6g/91508349928.pdf In PDF document text
    • http://ydyb.com/filespath/files/20210910005751.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/37756477084.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/49260507881.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/wapemokapoj.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/13546494168.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gerezoxegepajosumegovax.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/rofukofolewom.pdfIn PDF document text
    • https://kimansion.com/uploads/file/83623223293.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210901110629240016u2w083.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/rerajumexigisorijexojinik.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/xologalogenosotosatumuji.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/mezapiv.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-16/images/files/miwodizutizixotoje.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/48524513444.pdfIn PDF document text
    • http://tzsunup.com/upload/51964192548.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/26001674544.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/sakefabojujefu.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/98594908459.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/92564760026.pdfIn PDF document text
    • http://warehousetraining.ie/images/74936740618.pdfIn PDF document text
    • http://crm333.com/documentos/file/pufelisutate.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/59636603641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+online+book+download+sitesPDF 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_off0000ad2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2E 10536 bytes
SHA-256: 3b53264ed0fc789ddc5e6e4c60c5aa87b03e1d5bd5a90486cbeb7c9d4efb09a3
font_01_sfnt_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 13664 bytes
SHA-256: 98ef289fc8e4008c80cdcc3b838d75a0d19176f6d3b238434f6f4968a8e35c54