Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2751b5fbf46a16…

MALICIOUS

PDF

93.2 KB Created: 2021-04-11 20:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c3d7e968ebcf66c12b510729b0a9ae85 SHA-1: 4191dc9afac46a9da88c2fc8e63d81bda3140a04 SHA-256: 8b2751b5fbf46a1688e2d0e351ae2856adf007828ddb95adc5f92de5fba88159
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm or disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs further supports this assessment. The document body's content, while appearing to be a music file title, is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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/65000750087.pdf In PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/keborezuvefubivuw.pdfIn PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/dapajinosez.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/34869944823.pdfIn PDF document text
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdfIn PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/2944445507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hivi+siapkah+kau+tuk+jatuh+cinta+lagi+mp3+320kbpsPDF link annotation
    • https://gradfutures.princeton.edu/system/files/webform/xafuzekimizitigemuseli.pdfIn PDF document text
    • https://thesanfordschool.asu.edu/sites/default/files/webform/31460711967.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/fasulegok.pdfIn PDF document text
    • https://thesanfordschool.asu.edu/sites/default/files/webform/63066688876.pdfIn 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_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 5988 bytes
SHA-256: cc6af7effcfe072640af833e9712a50fa39c25ff691bb3bb2e7bcad622abe74b
font_01_sfnt_off00013286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13286 11664 bytes
SHA-256: 1fec5883f0155ac9bb060df6f16f71e6320fb4bf6e9b5c59e40b203a8c0a78a0
font_02_sfnt_off000159fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FC 16132 bytes
SHA-256: 5df9a924020f3b47f20d23ec22d8572383feb6ad42681b2b1a3175c3053cc5e6

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