Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db38dbf12b854f4…

MALICIOUS

PDF

27.0 KB Created: 2020-04-11 09:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 573b1e2dde1ab5b895f3b64fbb0a0730 SHA-1: c3f99c6f2df5bfab2345cb95d58e7b0bef99c2bb SHA-256: 7db38dbf12b854f40607bc8c57b310d34770459db261214917cbd0728c809c4a
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a high likelihood of malicious intent, likely to distribute further payloads or engage in SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://sagensparrow.com/uploads/1/3/1/0/131070767/131070767.html#bosch+s9n51b+manual
    • http://silverlineinvestments.com/uploads/1/3/1/4/131412181/0fdb78c95be9.pdf
    • http://mpowered-living.com/uploads/1/3/0/8/130874400/1025728.pdf
    • http://holalearnspanish.net/uploads/1/3/1/4/131408788/4696561.pdf
    • http://101bamboofins.com/uploads/1/3/0/3/130323936/6540503.pdf
    • http://breathconsulting.com/uploads/1/3/0/2/130272880/xuvowije.pdf
    • http://renting4you.es/uploads/1/3/1/3/131398054/mejixifir.pdf
    • http://fatimalafayette.com/uploads/1/3/0/4/130435956/1d881f744976d.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_off000042ea.bin
b8c4b8f56b3648d8653d6b49528b4ea6054fd7ea4c2b9ce4782951cb8dc8bd14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42EA 7472 bytes

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