Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd81d6a051d670e…

MALICIOUS

PDF

43.4 KB Created: 2020-04-05 06:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 176318746a07d3897cbd2734eed43a45 SHA-1: 0a1e127c07d20e39fdc4b5b0565d893567a66921 SHA-256: dbd81d6a051d670ebfa029214a3718ef2dae0d58ca79954af09fa526e7ab1fbb
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be a link farm, likely intended for SEO manipulation or to distribute further malicious content through the linked PDFs.

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://kolhorim.com/uploads/1/3/0/4/130483295/130483295.html#teoria+individual+de+alfred+adler
    • http://roatanbackpackershostel.com/uploads/1/3/0/7/130738771/3034583.pdf
    • http://vegetariangrosirkitchen.com/uploads/1/3/0/3/130313091/efe59aa57.pdf
    • http://millenniumobile.com/uploads/1/3/0/4/130488736/25c20717c.pdf
    • http://kidsforcannabis.com/uploads/1/3/0/5/130542692/dagixedudutukas.pdf
    • http://ejshowroom.net/uploads/1/3/0/4/130483617/gelapulo_botodede_sukobifixinese.pdf
    • http://biancajpx.com/uploads/1/3/0/5/130539170/90c3cd.pdf
    • http://family-awesometime.com/uploads/1/3/0/4/130483275/danitip_bajixegu.pdf
    • http://amberdaniel.com/uploads/1/3/0/5/130551727/piromipiji.pdf
    • http://sweetgrassya.org/uploads/1/3/0/5/130590719/98d24b210d85f.pdf
    • http://normanluo.com/uploads/1/3/0/9/130969358/giwat.pdf
    • http://everittsjewelry.com/uploads/1/3/1/3/131380000/07a6e3b1ea7.pdf
    • http://psmcconsulting.com/uploads/1/3/0/6/130620275/957d0510.pdf
    • http://ineffablespa.com/uploads/1/3/0/3/130313140/jalawewonol_piwadiwowug_pivuwofi.pdf
    • http://countonaako.com/uploads/1/3/0/8/130815482/fe705b1.pdf
    • http://justsweetlovela.com/uploads/1/3/0/6/130640235/1069750.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_off00007fd7.bin
6a5d090c3d8877c21989903aaf4e0bf8e86337e9715617c0c537e37443232af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD7 8544 bytes

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