Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35fdab8e533e6aa…

MALICIOUS

PDF

28.8 KB Created: 2020-04-18 11:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e031d10df610d38e81fbc3af4875a52 SHA-1: 73bcfcbbdbe759e3b88f701611562478aeb15ccb SHA-256: b35fdab8e533e6aa4e18137fb9fb09df9d75da3fb2f750688e46e1056e4d174d
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to 'Velocity and acceleration vectors worksheet' and includes URLs that are likely used to redirect users to malicious sites. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the extensive link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://offplandubai.properties/uploads/1/3/1/3/131380000/131380000.html#velocity+and+acceleration+vectors+worksheet
    • http://uh-du.com/uploads/1/3/1/1/131163854/pugobafe-gizifobipudo-ripemewin.pdf
    • http://classicpearlsca.com/uploads/1/3/0/8/130814909/jozoxowagoredigavil.pdf
    • http://557townfarmroad.com/uploads/1/3/0/6/130621942/0881f49.pdf
    • http://mark5proofreading.com/uploads/1/3/0/5/130588501/vivemif_fiselafiduro.pdf
    • http://aastyling.com/uploads/1/3/1/0/131070874/zamepin.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_off000048cb.bin
4c7dcb93cbda30d4578f3aaa874b9ac262071749abb4ffe56e885613443e505e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48CB 7808 bytes

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