Malicious PDF — malware analysis report

Static analysis result for SHA-256 7662c9c6dda163eb…

MALICIOUS

PDF

39.3 KB Created: 2020-04-08 15:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 944276990b634c2606fc7430196c6169 SHA-1: 2e07a2f20ace0f1439c8368ee99dcdb715812dbc SHA-256: 7662c9c6dda163ebcbdc7e7bf6487efeccbfba3cc8ed9782f08b9c4bc9451b05
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution network. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could host further malicious content or be used for SEO manipulation.

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://mccoycookies.com/uploads/1/3/0/2/130270951/130270951.html#nursing+care+plan+ineffective+coping+alcoholism
    • http://tonkaforce.com/uploads/1/3/0/6/130603978/belivuv_geruvibiwubulam.pdf
    • http://oversightandreform.org/uploads/1/3/0/6/130640190/sazirod.pdf
    • http://tophockeyprospect.net/uploads/1/3/1/4/131406939/fuvisadosakajor.pdf
    • http://meowluxcathotel.com/uploads/1/3/1/3/131384024/9a7a3e169513.pdf
    • http://mermaidtidying.com/uploads/1/3/0/6/130620972/ab4382a98b7b3fd.pdf
    • http://fusionmedaesthetics.com/uploads/1/3/1/0/131070161/sudulup.pdf
    • http://elliottprofessionalsolutions.com/uploads/1/3/0/8/130814056/323829a10c20.pdf
    • http://wodscorecard.com/uploads/1/3/0/3/130313066/9800752.pdf
    • http://channingbenjamin.com/uploads/1/3/0/6/130604004/vugonunebaritepo.pdf
    • http://ac-creative.co/uploads/1/3/0/8/130874029/ravugidebet.pdf
    • http://designsbywebster.com/uploads/1/3/0/6/130621135/d5095.pdf
    • http://bespokeorganics.net/uploads/1/3/0/3/130323612/rotosuwojagi_valozet_panulipovifomo_vogivonefeki.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_off00007126.bin
874b7510c77c1f10097701ae30f2931d7b26165d3d61ded30542b1e5ab0cf0f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 7984 bytes

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