Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e7a54c3194c2fd…

MALICIOUS

PDF

38.4 KB Created: 2020-04-16 14:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: d19849e5cc9264ff0e6d3e7a7fd025f9 SHA-1: b0ffb4a1422c5e934a92f9b5be30cef965725c81 SHA-256: b9e7a54c3194c2fdf7a15f7b263ca03d28cb4dc13b59bb470918d8b5afd1b590
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains a URL that promises 'funny baby videos free', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aelmorris.com/uploads/1/3/1/3/131398295/131398295.html#funny+baby+videos+free PDF link annotation
    • http://industryhome.net/uploads/1/3/0/3/130323631/nosaxudu.pdfIn PDF document text
    • http://luismmojica.com/uploads/1/3/0/4/130488470/c8b685e1e63.pdfIn PDF document text
    • http://residenceconseil.com/uploads/1/3/1/6/131606293/bf11b84.pdfIn PDF document text
    • http://georgiayouthchoir.org/uploads/1/3/1/4/131454304/durag_legiruzut_dowele_xaxumotefiwoxav.pdfIn PDF document text
    • http://sustainablehousedaynr.org/uploads/1/3/0/7/130775513/mubunizewebuk_tipubaziledofeg.pdfIn PDF document text
    • http://jskcricketbettingtipsfree.com/uploads/1/3/0/6/130620456/5395407.pdfIn PDF document text
    • http://hopeforeswatini.org/uploads/1/3/0/6/130621187/288389.pdfIn PDF document text
    • http://budphotography.com/uploads/1/3/1/0/131070529/e43a4d4b.pdfIn PDF document text
    • http://floridamedicalverifications.com/uploads/1/3/1/4/131406893/5687891.pdfIn PDF document text
    • http://elenalourenco.com/uploads/1/3/0/5/130550756/4735049.pdfIn PDF document text
    • http://cosmetictattoostudio.com/uploads/1/3/0/5/130550755/1351739.pdfIn PDF document text
    • http://chengclinic.org/uploads/1/3/0/6/130620756/40fdec20a66.pdfIn PDF document text
    • http://theinkbeautybar.com/uploads/1/3/0/6/130604621/tifarijadulawuv.pdfIn PDF document text
    • http://pc-repair-essex.com/uploads/1/3/1/0/131070712/serekujazofa-biniveninusofu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6448 8132 bytes
SHA-256: 374dddbf2c3668e58239e00632ce50c70c51bd1b50e7dc25057684694f831997
font_01_sfnt_off000083c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C3 2652 bytes
SHA-256: 1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838

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