Malicious PDF — malware analysis report

Static analysis result for SHA-256 23641313cc477d82…

MALICIOUS

PDF

40.0 KB Created: 2020-04-07 06:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38ac01ff6d7e0f9a0f1fd3c75ee996d9 SHA-1: 6f0efa5ed27455ee3bc45eb1c51d8ecc73b6e057 SHA-256: 23641313cc477d8268ff8b7d31f92ee7255758e13129891f910a7bda2720b6a5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which could lead to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://clickinteriordesign.net/uploads/1/3/0/7/130776279/130776279.html#oraciones+gerundio+infinitivo
    • http://audreylewisinteriors.com/uploads/1/3/1/4/131438874/1149759.pdf
    • http://leveragingsimplicity.com/uploads/1/3/0/5/130590710/9443750.pdf
    • http://mistysoto.com/uploads/1/3/0/6/130621503/9548899.pdf
    • http://radbananablocks.com/uploads/1/3/0/6/130605119/8993794.pdf
    • http://visitwanganella.com/uploads/1/3/1/3/131379545/girujademumonadexev.pdf
    • http://andersonmichiganblueberries.com/uploads/1/3/0/5/130589348/rujububuwagurul.pdf
    • http://sierranevadaretail.com/uploads/1/3/0/6/130604247/jodin-nuzumod-sidijunixer-fuxesinawujeb.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_off00007222.bin
8746956b86f821cd8fb2759c1e16eaec1881fb6c499993f8f0892752faf30331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7222 8752 bytes

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