Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e9d5b39683fa34…

MALICIOUS

PDF

39.4 KB Created: 2020-04-18 22:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2c62d5ffd3b463e8318a8c7ba0698b8 SHA-1: 56d312c62638043b21d97ea4689a2781df4acfce SHA-256: 39e9d5b39683fa3449136fd0cbec6ba8eff3f0a00066693664666e04135b646c
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a significant number of external links, many of which point to domains that appear to be part of a link farm or SEO manipulation scheme. The document body is heavily obfuscated and contains embedded URLs, suggesting an attempt to lure users to external, potentially malicious, content. No scripts were extracted, limiting the analysis of direct malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://highlandrimpropertiesllc.com/uploads/1/3/0/4/130478484/130478484.html#tecnologia+da+informa%C3%A7%C3%A3o+unip+sjc
    • http://doorandwindowplus.com/uploads/1/3/1/3/131398109/tenuselesivuj_wowuwerab.pdf
    • http://pidormalis.com/uploads/1/3/0/6/130639553/risovibaromuze.pdf
    • http://blueoasisgroupllc.com/uploads/1/3/0/7/130739956/6925217.pdf
    • http://dolos.network/uploads/1/3/0/2/130272880/2741fae157.pdf
    • http://bgmnephrology.com/uploads/1/3/0/5/130589345/vonakawarovaw_wurewi.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_off00006c64.bin
c08b16f1c6b1285d6e1101fe586d34c9f78560a5f4207ee9d112a311ceca7120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C64 11140 bytes

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