Malicious PDF — malware analysis report

Static analysis result for SHA-256 686e3c792a0fdfd4…

MALICIOUS

PDF

33.6 KB Created: 2020-06-03 06:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f7ca406740803af30d4d1fe011f758 SHA-1: 453704c3fceb5d95678cfabbed1ac84dfe1823c1 SHA-256: 686e3c792a0fdfd4235261278085092b324b58c0bf32885e9916be763aeccdb6
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 on various domains, indicating a link farm or content distribution network. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or distribute malicious content, potentially via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ojibaby.com/uploads/1/3/0/7/130739695/130739695.html#minecraft+saklamba%25C3%25A7+server+ip
    • http://impisports.com/uploads/1/3/0/5/130590416/9438665.pdf
    • http://webdisk.michelepowles.com/uploads/1/3/1/4/131453453/11526.pdf
    • http://hiddenpotentialcoaching.com/uploads/1/3/1/3/131383864/8cce42d3001e.pdf
    • http://lssdata.services/uploads/1/3/1/4/131407465/3191460.pdf
    • http://divamusicfestival.com/uploads/1/3/1/4/131453651/vabuvu-muwirebakusani.pdf
    • http://ojibaby.com/uploads/1/3/0/7/130739695/terms.html
    • http://ojibaby.com/uploads/1/3/0/7/130739695/dmca.html
    • http://ojibaby.com/uploads/1/3/0/7/130739695/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jidiluda.files.wordpress.com/2020/05/lemofurixedajeri.pdf
    • https://pufikono.files.wordpress.com/2020/05/60568360490.pdf
    • https://pedojatorax.files.wordpress.com/2020/05/lajodokif.pdf
    • https://sujefeg.files.wordpress.com/2020/05/manosavisiwaxa.pdf
    • https://mogagebovadu.files.wordpress.com/2020/06/7646571805.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005533.bin
4f830b3dbd1bad51910dbe83a61e81efcec5b8a4cf117a223e5a0e138e63bfc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5533 10912 bytes

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