Malicious PDF — malware analysis report

Static analysis result for SHA-256 136bfb620f56c22c…

MALICIOUS

PDF

34.3 KB Created: 2020-05-24 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec34601a9a6911b57c06b4fd3fc9af0d SHA-1: b5b6ef935026843148b86ae5bd25c2aa12b121ff SHA-256: 136bfb620f56c22cbfea671fbf4f9df75de062fdc3189661f7ee748f5165c29c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to further malicious content or phishing pages, suggesting a tactic to distribute malware or conduct scams through a link farm.

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://prdelectrohydraulics.com/uploads/1/3/0/9/130969383/130969383.html#interjection+worksheet+for+class+5
    • http://youthdreamproject2016.org/uploads/1/3/0/5/130551033/893260.pdf
    • http://begoodtoyoudelivery.com/uploads/1/3/0/6/130604595/2330933.pdf
    • http://oakparkmediation.com/uploads/1/3/1/4/131453588/towiwaxed.pdf
    • http://ipv6.michelepowles.com/uploads/1/3/0/3/130323892/9e3edf50cb2e.pdf
    • http://showermedtherapy.com/uploads/1/3/1/4/131483719/madaw_bolovotap_kiriginu.pdf
    • http://ltconstruct.com/uploads/1/3/0/2/130289096/361346c.pdf
    • http://hhihomeinspectionservices.com/uploads/1/3/0/4/130491075/1167091.pdf
    • http://hostmaster.jeremywest.co.uk/uploads/1/3/1/3/131398020/e25ef1371d06d.pdf
    • http://wholesalecbdblunts.com/uploads/1/3/0/2/130288492/6942338.pdf
    • http://justinvarner.com/uploads/1/3/0/2/130291551/funibepobifem_tezopisuvibeseb.pdf
    • http://translationshark.com/uploads/1/3/0/8/130874435/4d13c.pdf
    • http://coffeecreekrvstorage.com/uploads/1/3/0/9/130969391/9367219.pdf
    • http://helix-intraocular.com/uploads/1/3/0/7/130738666/9256227.pdf
    • http://itscaketime.org/uploads/1/3/0/2/130287279/5fa2122dd10.pdf
    • http://nancyhamiltonmyers.com/uploads/1/3/1/1/131163660/raduzobuza_novudopefevume.pdf
    • http://x0080670xstreamtravel.xsideas.com/uploads/1/3/1/3/131379371/ganolunupufuvebeti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b9e.bin
2897ab249161d0f9cbd0cd43a4d767e218fef0be471beec39bebf808ea3e4308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9E 9956 bytes

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