Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d78277fe87d006…

MALICIOUS

PDF

51.3 KB Created: 2020-06-16 20:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: fe426975b94125c12177bf7af412195b SHA-1: 4de6fc6465ebfdb5cac990b70be62aee1e14572d SHA-256: 87d78277fe87d0060f689942411e22f37a541cea0cfb09b5db49f704a89945ee
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, containing numerous external links to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to distribute content or redirect users through a network of linked documents. While no scripts were directly extracted, the PDF's nature and the high volume of suspicious URLs point towards a malicious intent, possibly to host malicious payloads or engage in click fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://godeco.fr/uploads/1/3/0/6/130621917/130621917.html#relation+and+function+class+12+pdf PDF link annotation
    • http://sandwichislandsnetwork.org/uploads/1/3/1/4/131483772/4472362.pdfIn PDF document text
    • http://oceanscasinogrand.com/uploads/1/3/2/3/132303175/puxamubenodajexoja.pdfIn PDF document text
    • http://atlanticoceanshippingprofessionals.com/uploads/1/3/0/7/130776518/lejix.pdfIn PDF document text
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.pdfIn PDF document text
    • http://limaelectric.org/uploads/1/3/0/4/130436074/8035751.pdfIn PDF document text
    • http://mta-sts.mail.savannahmarine.com/uploads/1/3/0/4/130476102/mavavajufot-kidamajurin-kepupifo-vevirufe.pdfIn PDF document text
    • http://hostmaster.whitstablefringe.co.uk/uploads/1/3/1/4/131409574/09f1c4.pdfIn PDF document text
    • http://sunnyvalespikers.com/uploads/1/3/0/5/130551338/narepiki_foxasojekokabe_fufosokofo.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off00006dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBD 5128 bytes
SHA-256: 80c209fc251ce12c170b2ae871aac83463de234a04de2735e72f0d8d60d8bd84
font_01_sfnt_off00007f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F49 12464 bytes
SHA-256: 62ad4f3a7297522d69bf643a0f4d17314fcc876694e87b2d9e1ac763fa7712bb
font_02_sfnt_off0000aa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA31 16496 bytes
SHA-256: 8ce09ab288537ad2902c5fa4278ae25bbdb31745359d4167941a1bf7c63f8295

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