Malicious PDF — malware analysis report

Static analysis result for SHA-256 345cb3a897d86868…

MALICIOUS

PDF

46.1 KB Created: 2020-06-17 00:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aee42dcafd4bb1111ffe4774e8ec0e4 SHA-1: fd4adec80f7cb072d7d5c54989091858be569f01 SHA-256: 345cb3a897d86868f0afa45304556f3c616f213c9a0abc477739ed75f08a27c4
96 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 point to similarly structured URLs on different domains, indicating a link farm for SEO manipulation. The document body, though partially corrupted, contains references to 'Fireray 2000 beam detector manual' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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://adsl-63-204-18-58.benefitplans.org/uploads/1/3/0/7/130739278/130739278.html#fireray+2000+beam+detector+manual
    • http://sayorale.org/uploads/1/3/1/1/131163535/5a6e2f62d4f4e.pdf
    • http://hostmaster.sabline.ch/uploads/1/3/1/6/131606293/054d9840.pdf
    • http://mta-sts.stjohnstuckahoe.com/uploads/1/3/1/4/131412235/5c093d5c.pdf
    • http://bestmena.com/uploads/1/3/0/5/130539120/vipine.pdf
    • http://pentecostalsofparkersburg.com/uploads/1/3/0/6/130621809/sowovizomataxop-duvivajop.pdf
    • http://motherblessing.info/uploads/1/3/0/6/130640125/8a1f6.pdf
    • http://shanisofficepreview.com/uploads/1/3/0/2/130272275/76aaea958369.pdf
    • http://hammcrafted.com/uploads/1/3/0/2/130270879/2472023.pdf
    • http://markbarrett.info/uploads/1/3/0/4/130483737/mopovanobojojej_podogazozab_wuzubovopo.pdf
    • http://orders.ghosttownbrewing.com/uploads/1/3/1/4/131453592/giveluwodej-jidag-tojedemobutimip-siroxeloxewato.pdf
    • http://mail.yourimmobile.de/uploads/1/3/0/6/130639546/pujovabezu.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_off000073e2.bin
65e6a2fab399533b45bb1115eddf378ef9fe83f39207f6dd4037ea796e837a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E2 5260 bytes
font_01_sfnt_off000085a4.bin
eafa7c58aa3c6e8907820a14d7c4434c9850f4bc235c0794afca046d91ddfa43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A4 10988 bytes

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