Malicious PDF — malware analysis report

Static analysis result for SHA-256 715d7fed67c9faeb…

MALICIOUS

PDF

29.3 KB Created: 2020-04-20 22:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8ab04749991d240ff546d34f90bf0919 SHA-1: 0ff6fac64e7b1ebe556ea17dc6cf90e8a8bba407 SHA-256: 715d7fed67c9faeb56f7f51de4c118e739089aeb83f889e9c6cc82ed9a9a3e55
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to other PDF files on various domains, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://growfoodnotdebt.com/uploads/1/3/0/4/130475923/130475923.html#love+songs+telugu+ringtones++mp4
    • http://duodonna.nl/uploads/1/3/0/4/130483373/792744.pdf
    • http://hixpertgroup.com/uploads/1/3/1/3/131383409/sapenezefumor.pdf
    • http://divergent-devices.com/uploads/1/3/0/5/130588554/3e15d963c9a8e.pdf
    • http://httpwwwprairiestarlutheran.org/uploads/1/3/1/4/131407047/5c510.pdf
    • http://tonicbagsshoes.com/uploads/1/3/0/5/130588654/a7f2237b4ab3754.pdf
    • http://finbella.com/uploads/1/3/1/4/131438011/babizinalasusetusiv.pdf
    • http://artlyowlgallery.com/uploads/1/3/0/5/130590716/wiginex.pdf
    • http://photoshackrentals.com/uploads/1/3/0/5/130590564/xaziwek.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_off00004c76.bin
c550d583fa7e9802d552f0453cb9f1c8390dc746559c42b55d20477f58c840b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C76 6928 bytes

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