Malicious PDF — malware analysis report

Static analysis result for SHA-256 163b08ed9f3e6c81…

MALICIOUS

PDF

121.3 KB Created: 2020-03-30 04:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 743e07fcd0e931ad4235b93c58aca380 SHA-1: 140228cfbfd1e02180962322869c0392ab6e0a69 SHA-256: 163b08ed9f3e6c817c6d82d5ba1d3a3ab63084ebb03f1ad09220d4c9df974dc2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous external links, suggesting a link farm or redirection mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure strongly suggest the document is a delivery mechanism for further malicious activity, likely involving JavaScript execution or exploitation of browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jessica-and-jaso-1.rominastiebenphotography.com/uploads/1/3/0/6/130621095/130621095.html#selenium+ide+tutorial+espa%C3%B1ol+pdf
    • http://epicchurchnetwork.com/uploads/1/3/0/3/130313177/2214668.pdf
    • http://indianrivertimes.net/uploads/1/3/1/4/131407083/ecfbd887c3.pdf
    • http://13825businesscenter.com/uploads/1/3/0/5/130540501/9229f6b.pdf
    • http://ebifabricsquilting.com/uploads/1/3/0/2/130271098/54f7cb.pdf
    • http://garmrnetworks.com/uploads/1/3/0/7/130776518/771aeaa4312.pdf
    • http://reinbvinterieurbouw.nl/uploads/1/3/0/6/130621958/79db28f378e3.pdf
    • http://onlypureessentials.net/uploads/1/3/1/0/131070627/7f5ad70acb.pdf
    • http://saturdayfairs.com/uploads/1/3/1/0/131070602/senusovejure.pdf
    • http://m1cg.com/uploads/1/3/0/6/130604902/08c08fc.pdf
    • http://acavengers.com/uploads/1/3/0/4/130483350/4434873.pdf
    • http://hilltopbakes.com/uploads/1/3/0/2/130291803/savenixin.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_off0001ae04.bin
d7d2fdb9b934fab260140f6ef715e866a2a7b57f9aef2664e43c1f4542b5f6ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE04 10952 bytes

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