Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c05838bdec165d2…

MALICIOUS

PDF

80.3 KB Created: 2020-04-12 00:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4a0b5c3c0f8c68d3b785906f723760b SHA-1: 04df985a981be937df142a2c44f589e518023cde SHA-256: 4c05838bdec165d2b6865b669788468d552b9e924be53b6b7a57979ae3d93870
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which appear to be SEO spam, directing users to various domains. The document body mentions 'Dell optiplex 760 diagnostic lights', suggesting a lure to attract users searching for technical information. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://jessicalgervaisbooks.com/uploads/1/3/1/3/131398533/131398533.html#dell+optiplex+760+diagnostic+lights+1+2+4
    • http://keepinitsaltyoutfitters.com/uploads/1/3/0/6/130621689/kigumar.pdf
    • http://preceptbyprecepthiding.com/uploads/1/3/0/3/130379336/dd438.pdf
    • http://stupidwork4u.com/uploads/1/3/0/4/130483961/2235316.pdf
    • http://utahfilmcomposer.com/uploads/1/3/0/6/130639574/vafomebunekalo_paxineverupar.pdf
    • http://kinseyyoungquistlmp.com/uploads/1/3/0/3/130313063/jixuzap.pdf
    • http://lumencircuits.com/uploads/1/3/0/5/130588342/lumugu_sebizozape.pdf
    • http://newbioconsulting.com/uploads/1/3/1/4/131455232/6092281.pdf
    • http://spectrumhorizonshealth.com/uploads/1/3/1/4/131437087/62195acab436469.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc71.bin
1b9ad876d3765bafb3edb749f4b8cffe275c6c99b5947bc78521d101b4318819		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 8600 bytes
font_01_sfnt_off00011daf.bin
45c39c4315a5d00962143d4102937301eb2649728d6de39b959633cfc30365c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 16144 bytes

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