Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a043f79e4457615…

MALICIOUS

PDF

34.9 KB Created: 2020-04-11 10:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24df747b17f4a2c1107a532ea90207a0 SHA-1: f841ab0e624493830d2f71999e2824fe25c3257d SHA-256: 5a043f79e4457615c3b8d027526c60b9feef66fbdb04b610e5b86c2f0e557cde
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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://mindforyou.org/uploads/1/3/0/7/130738679/130738679.html#peavey+5150+iii+schematic
    • http://mavely.in/uploads/1/3/0/8/130874320/revatemos.pdf
    • http://stgregschurch.org/uploads/1/3/1/3/131383594/c2d4e0e11d.pdf
    • http://rossunlimitedinc.com/uploads/1/3/0/8/130815726/folizakodexagojori.pdf
    • http://donnabarkley.com/uploads/1/3/0/4/130477613/xufosinoxazumaxe.pdf
    • http://holisticmassagenow.com/uploads/1/3/1/4/131437087/jutewitamuf_gezivo_dudam.pdf
    • http://salinastowing.com/uploads/1/3/1/3/131381619/tesepube.pdf
    • http://landmarkconstructionnw.com/uploads/1/3/1/1/131164251/d005942.pdf
    • http://64-160-90-248.pacific-solutions.com/uploads/1/3/0/7/130775162/netiza_kajekawimozi_noteri_torajazupenosa.pdf
    • http://sddesignsgallery.com/uploads/1/3/0/4/130488574/4211203.pdf
    • http://whiskeypatriotmembers.com/uploads/1/3/0/3/130324126/nagigifo_tobedo.pdf
    • http://heritagepaving.net/uploads/1/3/0/4/130488512/3378036.pdf
    • http://romanhydzik.com/uploads/1/3/0/5/130551661/sirerowex.pdf
    • http://cubistengineering.info/uploads/1/3/0/7/130775104/f6f44754a76d.pdf
    • http://juicebarhealthbeauty.org/uploads/1/3/0/7/130740571/5340466.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_off00006219.bin
1593431e11b4c762cba5766ef51633f44c3dee291b93e467ade296e7100cbebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 7436 bytes

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