Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a1c8eac2103d30…

MALICIOUS

PDF

37.9 KB Created: 2020-03-30 15:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5b12aa855a480d78a4f82b756fd57fed SHA-1: 99dab7da9cb15a2cca0b209a5d402adf495fb20a SHA-256: 05a1c8eac2103d302c9ef9f61483640f767c2d36465c3e22ad2d93038f99345c
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this sample as malicious. The document body contains a mix of seemingly legitimate text and URLs, suggesting a lure to a large collection of linked PDF documents hosted on various domains. The primary purpose appears to be directing users to these external resources, which could be for SEO spam or to host further malicious content.

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://host115.carmichaelnl.com/uploads/1/3/0/9/130970014/130970014.html#hp+photosmart+c3100+error+printing
    • http://welikitretreat.com/uploads/1/3/0/6/130605198/logotefexabexajude.pdf
    • http://bendavidsonministries.com/uploads/1/3/0/2/130272898/3128908.pdf
    • http://bel-airmaritime.com/uploads/1/3/0/2/130272318/vixezogatas.pdf
    • http://betsyharris.com/uploads/1/3/0/5/130588201/naxudixu.pdf
    • http://zionlutheranclark.com/uploads/1/3/0/2/130271206/61004023bb.pdf
    • http://thejoelrobinson.com/uploads/1/3/0/6/130604982/ximevenogolu.pdf
    • http://cloud9forlife.org/uploads/1/3/0/6/130640090/16f1f2f065c46c.pdf
    • http://everdreamin.com/uploads/1/3/0/7/130739082/dixupisumanuj_xotoga.pdf
    • http://cathydollbangladesh.com/uploads/1/3/0/5/130551302/42fc1eb4cf7116.pdf
    • http://the-art-of-music.org/uploads/1/3/0/2/130272851/gifunevesuzi-loxena.pdf
    • http://renovbati.fr/uploads/1/3/0/6/130639465/mikepatagamope_petesatove_gawapifu_depeminatilupe.pdf
    • http://dngraphicshawaii.com/uploads/1/3/0/6/130639948/e437ace.pdf
    • http://wnycfh.org/uploads/1/3/0/5/130544303/zutitidamu_getoj_zelirabukuzako.pdf
    • http://technicalpowerservices.com/uploads/1/3/1/3/131379256/jofovamelonipu_lilipejunatuxu_rajevurunotule_kafugobo.pdf
    • http://brakor.no/uploads/1/3/0/3/130313271/d7c73574657a8.pdf
    • http://tellascarystory.com/uploads/1/3/0/7/130776134/71256.pdf
    • http://obtainablewellness.com/uploads/1/3/1/0/131070189/307062.pdf
    • http://dancemovesga.com/uploads/1/3/0/8/130814258/zekojuso.pdf
    • http://changelaw.org/uploads/1/3/0/7/130776120/db8cbfea.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_off00006c0c.bin
5fe8b886f8779330a263bc2f3160e44c04e5055ad2ea1802803f1fbbda66c956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0C 7596 bytes

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