Malicious PDF — malware analysis report

Static analysis result for SHA-256 175dc7fc1f7d1b6e…

MALICIOUS

PDF

48.0 KB Created: 2020-04-08 09:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 745b0563fbab1c6c4bee4675ed59995e SHA-1: 8d78de5bdc0549e071946aef9a55efe7bd2768ad SHA-256: 175dc7fc1f7d1b6ef158ec0420ebb81b0c26086e0b09869e3ebca3528de68fc6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, suggesting an attempt to drive traffic or distribute additional malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is largely unreadable binary data with some embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://teamnewhorizons.net/uploads/1/3/0/8/130813710/130813710.html#palabras+en+distintas+lenguas+romances
    • http://toolmarket.site/uploads/1/3/0/2/130270879/7390400.pdf
    • http://1eartchchangesmusical.com/uploads/1/3/0/5/130590622/84965c60ed.pdf
    • http://selambalaj.com/uploads/1/3/1/3/131381539/7271437e694c42e.pdf
    • http://naturalbirthaustralia.org/uploads/1/3/1/0/131069961/998f682ee709.pdf
    • http://integr8communications.com/uploads/1/3/0/5/130550960/f047c973.pdf
    • http://jessespringsclothing.com/uploads/1/3/0/5/130551756/sotuxodoludijod-jufusolojej-punifebatezo-fosetitudodosu.pdf
    • http://patiocoverideas.net/uploads/1/3/0/9/130969682/5163162.pdf
    • http://ctpa-tw.com/uploads/1/3/0/5/130589274/xifobifiziku_zeril_kelezaxunureso_zideb.pdf
    • http://charlottesvillecohousing.com/uploads/1/3/1/4/131453288/fujetobaxonuket.pdf
    • http://hawaiianliterature.org/uploads/1/3/0/2/130272428/bubiwiwipilaz.pdf
    • http://ipoopedinthewoods.com/uploads/1/3/0/7/130740461/6ece2abe.pdf
    • http://bossofthesauces.com/uploads/1/3/0/6/130639091/tebaka-nawabozirakate-jexipozutekop-fugusu.pdf
    • http://100hunts.com/uploads/1/3/0/9/130969062/860b0cc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f8b.bin
8600cfe92b40ddf17ee89c0695aa41bdc4f16c274effb1444eab548c09aecd29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8B 9532 bytes

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