Malicious PDF — malware analysis report

Static analysis result for SHA-256 352ad7094c0cb036…

MALICIOUS

PDF

37.6 KB Created: 2020-04-14 09:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 392fd69d71b5fd83204aeb80f34c8b36 SHA-1: 7fbb4fe66746d416598aceb37020f454a5d1b257 SHA-256: 352ad7094c0cb0367a0cb872996939d0c6b2cc0cbffc0ea4828340a47a2b6b15
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, with numerous embedded external URIs pointing to various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The primary attack pattern involves luring users to potentially malicious external sites through these links.

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://wd40home.com/uploads/1/3/0/7/130775917/130775917.html#jcdr+case+report
    • http://openseaslegal.com/uploads/1/3/0/6/130604349/45d9cf71c34c5a5.pdf
    • http://greenroomcoaches.com/uploads/1/3/0/5/130590567/zikorep-zivabedemofunut.pdf
    • http://riverdalecommunitycenter.com/uploads/1/3/0/2/130288630/2545227.pdf
    • http://mynewdomainlive.com/uploads/1/3/0/4/130488357/zedusig_wurav_sirob_woxesoxekowoxom.pdf
    • http://theleawoodfamilydentist.com/uploads/1/3/0/7/130739806/wizatebesimujun.pdf
    • http://squareboxcompany.com/uploads/1/3/0/5/130588964/rexunijixupuku_wazawoluj_lolumixaxunupug.pdf
    • http://offcentervt.org/uploads/1/3/1/0/131070279/40b6c9cd17.pdf
    • http://nordicwarriortraining.com/uploads/1/3/1/3/131398575/7a91d0dc6f2ac6.pdf
    • http://2001silveradoz71.com/uploads/1/3/0/4/130489054/88b76e77e4a6.pdf
    • http://nzgirls.org/uploads/1/3/1/3/131380845/pujegewelapog.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_off00006a59.bin
af1cc122511723423d8a1839bdd5faab1ec01ce2312b537a4f28687a2d4a1453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A59 8420 bytes

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