Malicious PDF — malware analysis report

Static analysis result for SHA-256 8955b98fd726e8b9…

MALICIOUS

PDF

72.9 KB Created: 2020-04-02 08:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5424516e3f057a3f5e90d795032d71eb SHA-1: aa87063a45a3c8af9884c0d7c090b23d7f1581e0 SHA-256: 8955b98fd726e8b951fb31a286f517db185b532c0ac5b41b6a2c2b3afd93fdd9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign, likely involving spearphishing to distribute this document.

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://bytecubed.io/uploads/1/3/0/9/130969566/130969566.html#espantos+de+agosto+personaje+principal PDF link annotation
    • http://evo-hemp.com/uploads/1/3/0/3/130324011/fesofusun.pdfIn PDF document text
    • http://litbandit.com/uploads/1/3/0/4/130483625/dc6795c5.pdfIn PDF document text
    • http://ajshealthandbeauty.com/uploads/1/3/0/4/130436519/7c1740.pdfIn PDF document text
    • http://svkmngroup.net/uploads/1/3/0/6/130621359/lazeruwa.pdfIn PDF document text
    • http://www.reunioncityfilms.com/uploads/1/3/0/5/130546036/ac236b8.pdfIn PDF document text
    • http://envyucollection.com/uploads/1/3/0/4/130477048/milaladase.pdfIn PDF document text
    • http://ivneglobalservices.org/uploads/1/3/1/1/131164250/lemewaxaw.pdfIn PDF document text
    • http://kanon.photos/uploads/1/3/1/4/131438442/xanutajixuxaseponok.pdfIn PDF document text
    • http://maslinda.gr/uploads/1/3/0/2/130271080/6e14ade.pdfIn PDF document text
    • http://pittsborofamilytherapy.com/uploads/1/3/1/1/131163856/famadikisupu-vunerotibep.pdfIn PDF document text
    • http://amelieferris.com/uploads/1/3/0/7/130738831/7e201a6f68b46c.pdfIn PDF document text
    • http://cocktailsexpress.com/uploads/1/3/1/0/131071145/f2c76200cae.pdfIn PDF document text
    • http://miniturecowboysrus.com/uploads/1/3/0/6/130620572/sipimu.pdfIn PDF document text
    • http://ianwrightmedia.com/uploads/1/3/0/5/130540021/4726168.pdfIn PDF document text
    • http://c2nutritionandfitness.com/uploads/1/3/0/5/130540609/e2162f51468.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 1888 bytes
SHA-256: eb8cf970f7fbc00a6c6a3e60a1f2416a280371eb4fe4c509803b0d51b5f2ff70
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 10364 bytes
SHA-256: acaea5980dc18fbec2c1342c333f2f0311b56b390afcf76d0a0a0a851f9842e7
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 16064 bytes
SHA-256: 55bcb46a4743dbccd7b6324f3dabf11f2e9efef3c21b656ed0296f7b17b3e197

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