Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab4ba415d9643fe…

MALICIOUS

PDF

36.8 KB Created: 2020-03-11 05:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7076796163921cd1e3b747b18a1df165 SHA-1: 189ba2811597a621967d744ed5a53ffd8e49f29b SHA-256: 0ab4ba415d9643feac3db0b36c9e85abb325e381caf5e6a7c67b4f65023d7d83
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted across various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs suggest a potential for redirecting users to malicious content or phishing pages.

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://seetheworldtravel.voyagerwebsites.com/uploads/1/3/0/7/130775111/130775111.html#active+learning+strategies+in+higher+education+pdf
    • http://www.learncountryguitar.co.uk/uploads/1/3/0/9/130969149/5870470.pdf
    • http://grapheinsarl.net/uploads/1/3/0/4/130435938/fuwizase_zexixerewizajib_xozel_jaxoneg.pdf
    • http://pvcs2019.org/uploads/1/3/0/6/130640218/e040b.pdf
    • http://nedwaves.com/uploads/1/3/0/7/130775201/kafutamepumemefimora.pdf
    • http://www.christelmariedesigns.com/uploads/1/3/0/7/130739344/kuxukefubopi-baludatibol.pdf
    • http://enterprise-enchantedmob.com/uploads/1/3/0/4/130483286/8449616.pdf
    • http://sagebrushcountryllc.com/uploads/1/3/0/3/130313087/belajexazavos.pdf
    • http://riversidecountyhistory.org/uploads/1/3/0/8/130814706/5500712.pdf
    • http://aurasalontn.com/uploads/1/3/0/5/130539497/pisodaji.pdf
    • http://noellenadeau.com/uploads/1/3/0/7/130776076/kamekar_govulenerovonu_joxumus.pdf
    • http://lightingdesignlab.org/uploads/1/3/0/5/130539922/1498542.pdf
    • http://liqiyue123.com/uploads/1/3/0/4/130488829/5ec3ec2.pdf
    • http://mammothlife.com/uploads/1/3/0/7/130739544/mujujuzakim-wuruduvumeju-powetisu-vijimajudako.pdf
    • http://www.caseymillercocktails.com/uploads/1/3/0/5/130588221/844745.pdf
    • http://tiffsterevents.com/uploads/1/3/0/6/130620195/2873755.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_off0000658d.bin
4525cd44126a9e8f611f3c8f94afe4d2a6c5263686234eff015940dc87c112cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658D 7768 bytes

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