Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8deb39bbd06f45…

MALICIOUS

PDF

90.7 KB Created: 2020-06-04 20:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348028a3d2bf6720bb3ecaae7771639f SHA-1: b797c6900ad095641da0678cb326f696693d2d15 SHA-256: 6c8deb39bbd06f457b7e16939a1af6e4397b7711138643f946e65935b5a6d4f6
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs supports this assessment. While no scripts were directly extracted, the PDF structure and embedded links suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://29.bpmtc.com/uploads/1/3/1/1/131164129/131164129.html#clinica+analitico+comportamental+pdf
    • http://victorycc.org/uploads/1/3/2/3/132302989/minadezelozelu.pdf
    • http://skagitgroupinsurance.com/uploads/1/3/0/2/130272420/xirupira.pdf
    • http://laruelawoffice.com/uploads/1/3/0/9/130969655/bifuroroxapom_sujivivurizeg.pdf
    • http://adleetrezevantmemorialchoir.org/uploads/1/3/0/6/130604678/zagegexul.pdf
    • http://michellecmcadams.com/uploads/1/3/0/2/130272350/2112102.pdf
    • http://pc-helpme.com/uploads/1/3/0/5/130550891/lotilomeweli_xisomodo_mejed.pdf
    • http://realmeasuresusa.com/uploads/1/3/0/5/130590689/0d6cf2f33639.pdf
    • http://auroramovengangent.com/uploads/1/3/0/6/130603841/gafadud.pdf
    • http://ga400portfoliofinancing.com/uploads/1/3/0/5/130539840/bed1fd5f76d1.pdf
    • http://29.bpmtc.com/uploads/1/3/1/1/131164129/terms.html
    • http://29.bpmtc.com/uploads/1/3/1/1/131164129/dmca.html
    • http://29.bpmtc.com/uploads/1/3/1/1/131164129/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://revaxakel.files.wordpress.com/2020/06/wurufutegi.pdf
    • https://xumufikok.files.wordpress.com/2020/06/19990763083.pdf
    • https://wikanoxegi.files.wordpress.com/2020/06/lazukorelotaxewo.pdf
    • https://dinejazuvix64615744.files.wordpress.com/2020/06/38906359550.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013334.bin
ccfc38d621ed35ebb029a0024e2f672ccbf5f9a4e707b67569ee49e152c581df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 14256 bytes

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