Malicious PDF — malware analysis report

Static analysis result for SHA-256 d498b2e290d97314…

MALICIOUS

PDF

39.0 KB Created: 2020-03-11 14:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1093088112ba2574b7fcd1da6fd9f8a SHA-1: 4627380dce2a1e9586155dca08ef8498726ef9fa SHA-256: d498b2e290d97314ce3f69b36063178861a25c5784e1b9cefef9a320a0ab4f55
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of SEO poisoning or link farm abuse, as indicated by the PDF_SEO_LINK_FARM heuristic firing. It contains a large number of external links pointing to PDF files hosted on various domains. The ML classifier also strongly flagged this sample as malicious. The primary attack pattern involves directing users to a multitude of external PDF resources, likely to manipulate search engine rankings or distribute malicious payloads.

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://northwestuu.com/uploads/1/3/0/7/130775831/130775831.html#beck+depression+inventory+roche
    • http://50staaten.com/uploads/1/3/0/3/130379370/ginawususenefi.pdf
    • http://lace4all.com/uploads/1/3/0/2/130270869/6885504.pdf
    • http://blackswanpremium.com/uploads/1/3/0/8/130874652/xepidalajeji-gukojip-futegi.pdf
    • http://aztruemotorz.com/uploads/1/3/0/7/130775603/zibafaxav.pdf
    • http://myfinlandlimerence.com/uploads/1/3/0/5/130539325/raziwax-weviwezoluje-gagem-tapijuzaripejat.pdf
    • http://theaveragejoescigarstore.com/uploads/1/3/0/8/130874162/67a409942.pdf
    • http://www.pludarts.com/uploads/1/3/0/7/130739947/pexufurib.pdf
    • http://makingsensetherapy.com/uploads/1/3/0/9/130969923/sekidanetulu-durogo.pdf
    • http://www.missiononefitness.com/uploads/1/3/0/9/130969542/sidawajo-woxuriwafite.pdf
    • http://www.campcedarwood.org/uploads/1/3/0/6/130620728/7c692.pdf
    • http://reveriecoffeeco.com/uploads/1/3/0/7/130776205/pelidefibegid_tufozexi_nafaze.pdf
    • http://siawebllc.com/uploads/1/3/0/5/130588433/sumakupudave.pdf
    • http://www.softballslugfest.com/uploads/1/3/0/9/130969628/sunawo_nivux_fobanapowulone.pdf
    • http://bisconsulting.it/uploads/1/3/0/6/130640021/ditakolapipe-sekebu.pdf
    • http://magictouchpartyandevents.com/uploads/1/3/0/9/130969725/3e0a92222bc04.pdf
    • http://www.embu-shinken.com/uploads/1/3/0/6/130604140/8467800.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_off000070a4.bin
70b031a4f12fac13ae8d70de9a3d2290395253f43d307f0f4ef9bd3bf22a060f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A4 7788 bytes

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