Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b7a293b8885987…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 16:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ce93f5cd174a6fae27ac8c3dd8be7e5c SHA-1: 7416418e7419f07e52fd44169d2799733abc3aa6 SHA-256: c6b7a293b8885987da3b7d8fde0ab9f97789b5c33c13164e10fa64a6d3b84300
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cottoneauto.it/userfiles/files/66028236442.pdf In PDF document text
    • https://prestinieurope.com/userfiles/files/6942104347.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/2782234070.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/fapebalevupipepix.pdfIn PDF document text
    • http://amandamaitland.com/images/file/30066290504.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/vorufaxedixoxowomitezodef.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/39214347445.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/33627008873.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/ximedotukodanevojonufexok.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/56981783460.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/xudugesa.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/tobodevebugir.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/40052708849.pdfIn PDF document text
    • https://ip-pharma.net/data/files/77558174539.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/vegoxedetejubururipanezil.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/zagozitibaxivamun.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa41b5d6f---12651315439.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/42958435756.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f4cd1b63---10503055255.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/lidewifumepupuwukufut.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/benisegomakote.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/mifogakuzikej.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/75379644552.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/gaxuxotatufuj.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/92026074390.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/bisofuvopijuxisoror.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/kafukawovagavisowoleluro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=revista+natura+ciclo+12+2018+argentina+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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 11508 bytes
SHA-256: f6af34e01d18c3e773274cb8fd3404845e971a56ea43ee0fbce8ee4c0ef3e219
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 21156 bytes
SHA-256: a97c2996f84f822b5c66400c51736aa0257baeb5f565cd3309dd9d5c2e6fcee8