Malicious PDF — malware analysis report

Static analysis result for SHA-256 b191f4e41a05f60b…

MALICIOUS

PDF

65.3 KB Created: 2021-04-12 00:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7cc35e14fcd377635a5044cff259e55 SHA-1: c0c18827fbcaef543d591ffa266e4468c91f1ad9 SHA-256: b191f4e41a05f60b90ff91ee596826edd5694127b109b716f67f39326707c0cf
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cicatsalud.com/html/sites/default/files/webform/604022749.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/bulurifabisiwotubavigivos.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bariwogutal.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/zomufajiwadusepa.pdf
    • http://portal-mysigma.com/system/files/student-proof/wofofokarawivuboniju.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/sowasipaxezok.pdf
    • https://www.jts.org.jo/sites/default/files/webform/wijuwimitixatedus.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/basolidigululaba.pdf
    • https://www.jwico.com/sites/default/files/webform/kupoxogij.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/77861868930.pdf
    • https://www.jsif.org/sites/default/files/webform/54003515034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=greek+gods+and+goddesses+family+tree
    • https://community.princeton.edu/system/files/webform/jidubiziro.pdf
    • https://campusrec.princeton.edu/system/files/webform/jelozubunumi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e5.bin
8bc6d7e8c8375477b62546babe6b905aabb08a0f0f3295353ec157df4dd329ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 5424 bytes
font_01_sfnt_off0000d858.bin
a9dc7bd6a28c53abc9c4cc131ec1e6af41433a13148480dde48571575ae381fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 11056 bytes

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