Malicious PDF — malware analysis report

Static analysis result for SHA-256 e802f7e0169119a1…

MALICIOUS

PDF

31.3 KB Created: 2020-05-17 10:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3991586f2d2c2bffab91a92b6e94a3 SHA-1: f6a33148b7a4387cb060048141f4418a7ed5906f SHA-256: e802f7e0169119a132dc1dce90b0f38c914cef4a15f8cc2a3a16efd8c0ff9afc
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text and extracted URLs suggest a link farm or SEO spam tactic, potentially leading users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://polarfx.net/uploads/1/3/1/8/131871571/131871571.html#algorithm+analysis+and+design+notes+pdf
    • http://summitapparelpc.com/uploads/1/3/1/4/131406591/799378c914.pdf
    • http://qacollective.com/uploads/1/3/0/4/130488983/953683.pdf
    • http://dayseye.org/uploads/1/3/0/6/130639935/fa0c9b17b65a.pdf
    • http://westlondontrading.com/uploads/1/3/0/6/130620581/zenuf.pdf
    • http://foundationbff.org/uploads/1/3/0/7/130740027/65194.pdf
    • http://alyssagarberwrites.com/uploads/1/3/0/7/130775191/wewuzitiwef.pdf
    • http://charlesberg.org/uploads/1/3/1/6/131637109/busuwel.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_off00004fce.bin
61d8975973d4712760855a5e46ce748fc1f72e57ea90ac32910d42066de125a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCE 10196 bytes

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