Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c62d5bf1bb8de8f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 13:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2eb83888934c9eec3ba88f5cdc0f57b3 SHA-1: 5794ae604055c8372fb917ebc7fc5ca8d2a654b7 SHA-256: 8c62d5bf1bb8de8fe1d17c70ce76e5294f29a389c9e00d83cfd5a15b6ca7f21d
166 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to other PDFs hosted on various domains, including one directly on an IP address, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://ncsccalgary.com/userfiles/files/bumufevukebujove.pdf In PDF document text
    • http://eiak.org/upload/editor/files/kisebizagife.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/25727758514.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/58088781378.pdfPDF link annotation
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/28403573742.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/22927986694.pdfIn PDF document text
    • http://selidbe-beograd.info/files/roxada.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/94217155209.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zonowemip.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/jumek.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/jegebodizadufikofikubur.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/75209613546.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/fidepikazejagivanowidif.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jozuxitozobukate.pdfIn PDF document text
    • http://wych123.com/upload/files/loxoxos.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/7457062127.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/18778410393.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/93866888697.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/kazuxigoboxufubopivabeva.pdfIn PDF document text
    • https://medtek.vn/storage/file/84469120947.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/25434266843.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/55500455453.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/2345959861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=onenote+for+android+tablet+downloadPDF 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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10428 bytes
SHA-256: 5122fdbfa88535cbf7b5692839bb90b79823968d110d7ac3c693d9c6c6087c97
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 17612 bytes
SHA-256: 1d8c4a305e1c9712bcdc957f75f998b8b39792f65a171ad07533583e4b9bfbae