Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f755b04e576ac6c…

MALICIOUS

PDF

36.9 KB Created: 2020-06-07 09:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0842c91ccaa9913b3818e8d956056299 SHA-1: 61e469f94f88e5596c03f07762b0365878c65543 SHA-256: 4f755b04e576ac6c92b80478cbafa9c5e1b30f8c55456cf02e66a7cea5ff027f
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded document body also contains several of these URLs, suggesting the primary purpose is to redirect users to these external resources. The ML classifier strongly supports the malicious nature of this PDF.

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://acebookkeeping.ca/uploads/1/3/0/7/130776632/130776632.html#lan+qu%25E1%25BA%25BF+ph%25C6%25B0%25E1%25BB%259Dng+3+banhtv
    • http://workhabitscommunity.com/uploads/1/3/1/3/131379194/xadewiwa_ganakoxejafib.pdf
    • http://qatravelsupplies.com/uploads/1/3/1/8/131858791/sutabi_kesodixogavu.pdf
    • http://my-medicare-insurance.com/uploads/1/3/0/4/130483514/9866402.pdf
    • http://savoypropertyforsale.com/uploads/1/3/1/4/131437064/1466139.pdf
    • http://dylanerens.com/uploads/1/3/0/4/130476271/2f7138d3.pdf
    • http://oldcolonyinnalexandria.com/uploads/1/3/0/6/130620251/jegemobuganumowe.pdf
    • http://legendarypearls.org/uploads/1/3/0/2/130291640/8210352.pdf
    • http://linksvirtualgolf.com/uploads/1/3/0/7/130740385/64ba67823e67.pdf
    • https://rulesuwasok.files.wordpress.com/2020/06/fiwegotafog.pdf
    • https://bojusinowawa.files.wordpress.com/2020/06/18844035858.pdf
    • https://xaboposori.files.wordpress.com/2020/06/sedijex.pdf
    • https://tesodufow.files.wordpress.com/2020/06/kabivakonawelonanozizeg.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_off0000591a.bin
b0dd0355230595c05f99f0ed3fa435801acc52f64218089b4524acda0d29ca84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591A 21480 bytes

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