Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d1a4cf606ea03a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 06:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 228e375c1a2849c1d29d81e2609ec99f SHA-1: 0b80c7fdd3b8cfc37ced07848a44265261b970b7 SHA-256: b4d1a4cf606ea03aa6f369686fbfdd7bc1e8afc32c99fa3c3eecc75f5f40909e
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, such as downloading a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://coretry.ru/uplcv?utm_term=pokemon+sun+and+moon+download+rom PDF link annotation
    • http://pusancard.com/userData/board/file/kunemememimunolebesixixip.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210913164735_1771077039.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/99956113261.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m2fadlrropv5pm0nd4pl1dvh86/90435411694.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/79190710356.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/molefupifiselinorixi.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/11782192784.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/48652157267.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020720004877.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/98727697229.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/92278404699.pdfIn PDF document text
    • https://blogsma.com/files/tifinegapabopozonoxipu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc78c4e2de---78019003232.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/15679453859.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/49614701442.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/tetagusinitide.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zevudonal.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18436481267.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/29293626842.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904081029.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/gixagupebedob.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51833058537.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/37806658496.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_off0000b47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47E 10496 bytes
SHA-256: 1c4e3fad21a7eb0204b846184bcf9b7f8e6dd065f01516541bd527ff12056e1f
font_01_sfnt_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 16484 bytes
SHA-256: 78bb8adb8c59138ef2a6531ac91c57f7014f21259d4a8cd4f5dedfe7b99e4f84