Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac46c4ef39bda7b9…

MALICIOUS

PDF

41.6 KB Created: 2020-06-15 22:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ab518c49a306e0d842ad00b59e7c15 SHA-1: 2e9485fff614ce02d4057d3496d4f5fd9ce23dce SHA-256: ac46c4ef39bda7b913c9ba7f1cffc19b7c0e99a75a8bf38cd1e26ba52b5a8716
96 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, embedding numerous external links disguised as a service manual download. The PDF_SEO_LINK_FARM heuristic firing indicates a high volume of these links, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

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://riort.be/uploads/1/3/0/3/130323892/130323892.html#suzuki+swift+service+manual+free+download
    • http://cpanel.newenglandbusinesscenter.com/uploads/1/3/0/7/130775242/munabe.pdf
    • http://hostmaster.oritrozin.com/uploads/1/3/0/5/130551859/gijegufawipigun.pdf
    • http://stteresaofavilacatholiccommunity.org/uploads/1/3/0/2/130288361/789134.pdf
    • http://austarict.com.au/uploads/1/3/1/1/131164128/5283519.pdf
    • http://breakthroughbroadcasting.com/uploads/1/3/0/4/130476148/gewuset_jozizekego_sudivemegip_bugeximupup.pdf
    • http://mta-sts.thelanguagegarden.com/uploads/1/3/2/3/132302921/dbb629c16.pdf
    • http://mail.mhdany.com/uploads/1/3/0/6/130639712/kenevunet-xilaxifes-zobuna-zusatuxuruzogir.pdf
    • http://indiginousscene.com/uploads/1/3/1/3/131379689/dedemavetaf_deros.pdf
    • http://general1948.com/uploads/1/3/1/3/131383383/1453577.pdf
    • http://buildamuscle.com/uploads/1/3/0/7/130774966/kejawexis-kekota.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fab.bin
931495b0243b688b9103cf9897f6496e85effbc248c58b1925398f9acafe9831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 11044 bytes
font_01_sfnt_off00008575.bin
29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8575 16132 bytes

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