Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ebd98faba6cc9f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 00:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba40e6cd5cec0e8bdafba7da75200982 SHA-1: a23af30e8a09d94539d720631858951aab0e12bd SHA-256: c5ebd98faba6cc9f788b990c47d89a533f6d267e835d548a56a88c85e5281819
146 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=launch+date+of+redmi+note+10+pro+5g+in+india PDF link annotation
    • https://balmbeach.hometeamcorp.com/images/usr/98778212763.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/29601272197.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/40814121989.pdfIn PDF document text
    • https://www.confirmedtour.com/files/serosidutoram.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/48404092148.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/92112948846.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/26367238147.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/pogapid.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/63202032846.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/zugunudufos.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/sutigowade.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/35508513310.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/loriwem.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/5636995998.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/porakojudubexoz.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/moxiwazot.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/risozajuperag.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c9b78c700fde6ab13a3780c07b4b216b/morujefudawomebenip.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/87044050796.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/41119044545.pdfIn PDF document text
    • https://cncunse.com/d/files/luguzitaxudozeniwigo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/47444740463.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/97374526250.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/latitaviluwegugidudomikan.pdfIn PDF document text
    • https://mimpidia.com/contents/files/44676394559.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_off0000b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 18356 bytes
SHA-256: 2bf8dfcaa6e0165441ae74882ba102c4de85942625ef2a270706ec864b1f3acf
font_01_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 11216 bytes
SHA-256: 47f4ae6bc52c2f134fcb61576628b508f1830905540a6a2ace7d66ff3b74438d