Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d6604a1c0b4755…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 20:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40063b70cebada886740c5411e16a200 SHA-1: bab275b7dad9cd1ac38e25d04d834e11ab2f8b70 SHA-256: a5d6604a1c0b4755d61025acd67573a59bf46afa5311b567decbb9216b693ee4
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It impersonates a cloud document lure, aiming to trick users into accessing external links. An embedded JavaScript stream was detected, which likely facilitates the execution of malicious code or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://repetitorebi.ge/userfiles/files/gogozoxuvel.pdf In PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/14335825026.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903001027560.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/19970585560.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-4/20210904060217219008.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/23136351664.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/33035707839.pdfIn PDF document text
    • http://hongdacable.com/d/files/xotutewumera.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vupazoloniko.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/wejesifuxefisudoboletiku.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/68269647144.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/54506790173.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wujawukobewavevitizavebe.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/mojemalus.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/49990032192.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vosavelelekotiba.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/19591950939.pdfIn PDF document text
    • https://matratva.in/userfiles/file/61905542733.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/76449025901.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/kojexekazujozexogib.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/40293771816.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/99585088108.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/2175134549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+my+android+phone+to+my+laptop+via+wifiPDF 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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 17604 bytes
SHA-256: 94b81a23b20dcf9f68c84906c20a3bbdf4fe25b921834ef1dca7f894574ec2cb
font_01_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10976 bytes
SHA-256: a4759a16e8c9ef0fae7ca2c193ad073cf21759094b3b3ebe16b72e11a4c6b6d7
font_02_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1