Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c995f28919c510f…

MALICIOUS

PDF

36.4 KB Created: 2020-06-12 05:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1409ec4a78abaae76fe72ba3ab054b SHA-1: 53d3ef159035fc8016d593262c7dc3dbac0e26fa SHA-256: 0c995f28919c510f981119c7afc8790d9aa548a4673a99aae9eae2b1182c8232
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs section. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a campaign to redirect users to malicious content or download further payloads.

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://4j4.undesirable.us/uploads/1/3/1/4/131437978/131437978.html#wireless+communications+molisch+solution+manual
    • http://supermakr.com/uploads/1/3/0/6/130621359/kowotodanito_gufuwo_xobevi.pdf
    • http://selwynspeechlanguage.co.nz/uploads/1/3/0/3/130379336/1888839.pdf
    • http://chathamconcertopera.org/uploads/1/3/0/4/130489131/borosojibuxil-tivininelimu.pdf
    • http://wpstage.facto.pro/uploads/1/3/0/4/130488699/bavones.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bafevojol.files.wordpress.com/2020/06/6363084722.pdf
    • https://govizugag.files.wordpress.com/2020/06/6932597069.pdf
    • https://fafuromap.files.wordpress.com/2020/06/66514317769.pdf
    • https://xagixamowow.files.wordpress.com/2020/06/pojusebaxom.pdf
    • https://netegoseze.files.wordpress.com/2020/06/70451479821.pdf
    • https://nirumepuna.files.wordpress.com/2020/06/25404175564.pdf
    • https://jakibit.files.wordpress.com/2020/06/82993689565.pdf
    • https://sekaronokom.files.wordpress.com/2020/06/70374406608.pdf
    • https://zolukid.files.wordpress.com/2020/06/86719810445.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_off000060f1.bin
dfa52d56468d7a2a4509fdd9a748e3cdb603cda9faf21c4fd9673d1e38c557e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F1 11188 bytes

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