Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff96a296f458dec…

MALICIOUS

PDF

34.9 KB Created: 2020-04-11 09:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 73c911e1d08c7a7788d811006ce58e8b SHA-1: fe4c686750dc28735d160f5abf74ec877828f15e SHA-256: 0ff96a296f458decc37fd6ac5902be9c21e2aba12a8575426743e6e011e5fa9d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicates maliciousness, and the embedded URLs suggest a potential for redirecting users to malicious sites or downloading further payloads. No scripts were extracted from this sample.

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://loskuatro20decalifornia.com/uploads/1/3/1/4/131407214/131407214.html#wilkes+fluid+mechanics+for+chemical
    • http://sediconsa.com/uploads/1/3/0/5/130551765/b11e776723a88.pdf
    • http://michelemartintaylor.com/uploads/1/3/1/4/131409037/busujadijaz.pdf
    • http://kindlyalhllc.com/uploads/1/3/0/5/130542692/jerolovoxufuneg.pdf
    • http://intreweb.ch/uploads/1/3/1/3/131380885/fozadilusupixig_fimeruxexubop.pdf
    • http://agacello.com/uploads/1/3/0/8/130813079/kixofevemos-jufimewoxuxi-lumasozijo-pogonotujo.pdf
    • http://12clubhairstudio.com/uploads/1/3/1/4/131407901/1544614.pdf
    • http://stylesetc.net/uploads/1/3/0/6/130604501/siwikamogegewipogu.pdf
    • http://mylittleponcho.ca/uploads/1/3/0/4/130483136/najizudima.pdf
    • http://designejl.com/uploads/1/3/0/7/130776182/siket-xodexibepufin.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_off00006146.bin
84ee8e95d40a668333ebac4284ca7cbc8993853bdc7659ed8f65a3916d7904fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 7732 bytes

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