Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef23f0c91e0acf8…

MALICIOUS

PDF

39.1 KB Created: 2020-04-23 12:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 367fce1a785aff43bf37d7e8d26cd40f SHA-1: 6f573bea9e35d7b94bda6e2327793c59aa57bdd1 SHA-256: eef23f0c91e0acf848d836ef9b111e74521775fdbfc82791244a164c2cefee09
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The presence of numerous URLs pointing to various domains suggests a link farm or a distributed redirection infrastructure. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://woodhilldoodlesandgoldens.com/uploads/1/3/0/5/130590139/130590139.html#sailor+moon+crystal+mars+transformation
    • http://amwaybyfiliz.com/uploads/1/3/0/4/130477414/xarixu.pdf
    • http://yonkosworld.com/uploads/1/3/0/2/130291499/3de1d27e3cdcb3.pdf
    • http://manzey.com/uploads/1/3/1/4/131482919/4c8a32b6.pdf
    • http://destinationdays.com/uploads/1/3/0/4/130483341/a2c6d15b3554ffb.pdf
    • http://lapalli.ch/uploads/1/3/0/6/130639998/43b53f19ab.pdf
    • http://almostarthistory.com/uploads/1/3/0/6/130605078/tijemokob.pdf
    • http://oceanblueint.com/uploads/1/3/0/6/130621228/tuzebepixusise.pdf
    • http://motorcitymint.com/uploads/1/3/0/7/130776255/2d2cf967a.pdf
    • http://surom.com/uploads/1/3/0/2/130287533/fibojinuwen-vowejifus.pdf
    • http://paparazziaccessoriesbyrenee.com/uploads/1/3/0/8/130813648/xusopaxevunez_pikifuginerires_pefovirafizorud_xuporetajoluba.pdf
    • http://maiadore.com/uploads/1/3/0/6/130605384/bekemimulikabu.pdf
    • http://treesrollingpapers.com/uploads/1/3/1/4/131483126/83d8dc720be419.pdf
    • http://treesrollingpaper
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006099.bin
9d5e456c01ec68803fb13320df0ece6267b4d9a13a3dc874f93971ddedc95177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 8000 bytes
font_01_sfnt_off00007f6a.bin
65f576c9869147e28f34cedb96a74717f9ad6bae705804c0d0a95f4c1e022b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6A 5112 bytes

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