Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7168b34fdfec6ba…

MALICIOUS

PDF

120.0 KB Created: 2021-04-02 14:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0f9526d8954ab0fb16fd9f445ec7b3bc SHA-1: 792749daa73493c58d3066a9f0756fe052a0c6ec SHA-256: a7168b34fdfec6ba15651538ad688672a2ee8e9cd36ae0cd1a50cb73a8c7e08b
146 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, impersonating a cloud document service to trick users into clicking malicious links. The presence of numerous external URIs, including one pointing to 'vilenefex.ru', and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly indicate malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://vilenefex.ru/wix?keyword=shazam+movie+download+netflix PDF link annotation
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/a0f699ca7bfa1.pdfIn PDF document text
    • http://kutefujuwusara.iblogger.org/saxopiboxegadubiju.pdfIn PDF document text
    • http://worldthailand.fun/73131627883ffzgf.pdfIn PDF document text
    • http://lonemap.medianewsonline.com/50318389681.pdfIn PDF document text
    • http://pshcomonhere.xyz/japanese_fish_liver_recipe7poos.pdfIn PDF document text
    • http://vegogik.iblogger.org/67586794237.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/english_stories_with_moral_values.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/jotumawofef.pdfIn PDF document text
    • http://towudarefu.22web.org/32717463221.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/91195357790.pdfIn PDF document text
    • http://xuforaxi.22web.org/analytical_techniques_in_electromagnetics_book.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/nimolozev16a9j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafevuzadolax.epizy.com/relative_pronouns_worksheet_with_answers.pdfIn PDF document text
    • http://nogogesusuwebob.epizy.com/sony_bdp-s3200_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6316cd8a-cd34-4449-915f-bec8918eb3fe/rumefali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b95366-13c7-4fe9-b934-4a3fc4edec72/puwadafigenoduwirituzikas.pdfIn PDF document text
    • http://kepikinol.epizy.com/kuxisezarogej.pdfIn PDF document text
    • http://jufofokisib.epizy.com/48011235426.pdfIn PDF document text
    • http://sidorigix.rf.gd/crossfit_program_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9205808c-d477-47a9-9af4-fd5a8086ca08/segamigis.pdfIn PDF document text
    • http://boragilaz.rf.gd/diario_dos_escritores_da_liberdade_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d27e68-4e1b-44fd-949f-443d463c540f/99895295639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34eea4e-0cd7-4e7a-bc1c-0f271cab5458/32128029874.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://scripts.sil.org/OFLIn 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_off00018113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18113 5248 bytes
SHA-256: 8b97267558cecc1cceb6406522047ad6c33e94381d0b0cc1601d6136f30f7315
font_01_sfnt_off000192ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192ED 12188 bytes
SHA-256: 6bf02dba7bccb7cfe0a7a58e6e69fb6e52eb8d4cb5273b7e8fae9a948869d72e
font_02_sfnt_off0001bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC9D 16172 bytes
SHA-256: 98e61ef0eee184491389eedffad6483e6d8ed088da7405a334da36aeb48d06e1