Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e883cfaa481a33…

MALICIOUS

PDF

46.9 KB Created: 2020-06-18 12:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 5464c89097c76ac689b20c4ca5804062 SHA-1: ea1532c583234bd1d8f62462dfa31804aa466371 SHA-256: f8e883cfaa481a33128d0c5eed2284664879c20f16802cfc90499decaa7257be
96 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 to other PDF files hosted on various domains. This pattern is indicative of SEO spam or a link farm designed to distribute malicious content or drive traffic. The document body contains obfuscated text and references to 'the nurbs book pdf', which appears to be a lure. No scripts were extracted from this sample.

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://lcjoiner.com/uploads/1/3/1/4/131406798/131406798.html#the+nurbs+book+pdf PDF link annotation
    • http://fullerealty.com/uploads/1/3/1/4/131437087/raranelofulone.pdfIn PDF document text
    • http://southernbasin.net/uploads/1/3/0/6/130639382/1b487b700ca911.pdfIn PDF document text
    • http://mhsclassof1976.com/uploads/1/3/0/3/130379051/fogagowaluzalifi.pdfIn PDF document text
    • http://ngantukz.net/uploads/1/3/0/5/130541765/muvexixufewusabu.pdfIn PDF document text
    • http://nobriefing.com/uploads/1/3/0/6/130605376/jezuxu_jegusipuropil_jesutunijebulik_wezop.pdfIn PDF document text
    • http://hostmaster.kidwellybowls.com/uploads/1/3/0/6/130604312/9234830.pdfIn PDF document text
    • http://mlhconsultancy.com/uploads/1/3/0/5/130542717/925879.pdfIn PDF document text
    • http://eeswfl.com/uploads/1/3/0/8/130874498/8896441.pdfIn PDF document text
    • http://mhcsutherland.com/uploads/1/3/1/4/131407293/1395341.pdfIn PDF document text
    • http://afuegofilms.com/uploads/1/3/0/7/130739836/sidemujiduwufedazunu.pdfIn PDF document text
    • http://graydogtrading.com/uploads/1/3/0/9/130969981/fitojexakivexiv.pdfIn PDF document text
    • http://easymacsupport.com/uploads/1/2/9/0/129099120/129099120.html?solidworksIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AA 4792 bytes
SHA-256: 7c6d19c8be9b3adfc32d17e46131b05df7d653ddd7e9df33a46f3ecc0b776916
font_01_sfnt_off000089c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C8 11700 bytes
SHA-256: a81bef87b3108f8a3778aca438732261dfd537afaae356c855b696c070eb0c33