Malicious PDF — malware analysis report

Static analysis result for SHA-256 141ddeaf61e50556…

MALICIOUS

PDF

36.7 KB Created: 2020-04-09 03:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d39db329b15af9941421d7c7fd33c75 SHA-1: 60d8826722084660a2ecc4c79dc48ebd5f0905c0 SHA-256: 141ddeaf61e505560082b913722bd37d6cbb658c5640f9f8c6b4bca099659bcf
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ciggysound.com/uploads/1/3/0/8/130874585/130874585.html#convert+plt+to+image+python
    • http://thesplotch.com/uploads/1/3/0/7/130739763/6171041.pdf
    • http://dmrackley.com/uploads/1/3/0/6/130604923/degos_zajawupoteg.pdf
    • http://hoeferlininstitut.ch/uploads/1/3/0/7/130739139/8523758.pdf
    • http://simplyhousecleaning.net/uploads/1/3/0/5/130588297/5507032.pdf
    • http://trevirent.com/uploads/1/3/0/8/130874300/fikonafonomu_jarabowurejivak_zupor.pdf
    • http://dealswithdessy.com/uploads/1/3/0/9/130969695/xukufa.pdf
    • http://2425york.com/uploads/1/3/0/5/130589305/kojapu.pdf
    • http://timezone-cbd.com/uploads/1/3/1/4/131437364/5975869.pdf
    • http://bowmanarts.org/uploads/1/3/1/4/131484467/3171322.pdf
    • http://bigjonfitness.net/uploads/1/3/0/8/130874614/gesobasu.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_off00006763.bin
4f4ac9a0641e5ba0f3afce1079089b8ca2f370c10e17e6817de7cac9e5e42fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6763 8036 bytes

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