Malicious PDF — malware analysis report

Static analysis result for SHA-256 710cea136cb146ad…

MALICIOUS

PDF

40.2 KB Created: 2020-04-17 13:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b0b5e37f81f06518817d8f49b3193568 SHA-1: d8ba3f03fec36dd7d5638fb54ee27f0f464298e2 SHA-256: 710cea136cb146ad4d0cbc7a03e70f2e9e3a412634b57722e3f5c02f97fa4ea6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to other PDF files with numeric slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://minibeast.org/uploads/1/3/1/4/131454089/131454089.html#fa+davis+drug+guide+16th+edition
    • http://the-mystery-box-2.com/uploads/1/3/0/2/130272573/nawap.pdf
    • http://melbournesecurities.cn/uploads/1/3/1/4/131407698/4755666.pdf
    • http://mitchsit.com/uploads/1/3/0/7/130775744/nolen.pdf
    • http://xinghe.info/uploads/1/3/0/5/130538816/zalifusugimemes-rikokamirowebo-vorur-gunerurip.pdf
    • http://blueeconomy.net/uploads/1/3/0/4/130483248/batapuzodeb.pdf
    • http://wrelo.com/uploads/1/3/0/5/130589098/7087188.pdf
    • http://2creeks.biz/uploads/1/3/0/7/130738484/faboduvoz.pdf
    • http://melisainc.com/uploads/1/3/0/4/130436197/dezorarosavamam-toxotolonit-wuzurorurapo-lelirifikas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006955.bin
bb4bc7c82a9f6d3eb366c310531a9fc18693eb15be4568645dcb4ac3160bbebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6955 8740 bytes
font_01_sfnt_off00008a80.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A80 1708 bytes

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