Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ea570a81e5eda…

MALICIOUS

PDF

38.7 KB Created: 2020-04-06 04:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb5d3084faf60ba428c3f9cf967adb32 SHA-1: d2bc38165c7bf3645e3fb121a90eb3cafe63becf SHA-256: a85ea570a81e5eda31eef7ced972f0e00f075b31983d02c97476ffac2fed6b5c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains references to philosophical periods and the wkhtmltopdf tool, suggesting a potential lure or obfuscation tactic. The primary attack pattern involves directing users to a network of SEO-optimized PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://preciousthingsboutique.com/uploads/1/3/0/6/130620956/130620956.html#principais+filosofos+do+periodo+helenistico
    • http://exclusivehoops.com/uploads/1/3/1/1/131164281/nepifoboduzam.pdf
    • http://thatantiqueshop.com/uploads/1/3/0/2/130272278/belik.pdf
    • http://ajauchinger.org/uploads/1/3/0/5/130544063/tupen.pdf
    • http://a1derryhomedoctors.com/uploads/1/3/0/5/130551920/30a64f.pdf
    • http://harborhomerestorations.com/uploads/1/3/0/7/130775979/6760853.pdf
    • http://mindbodhisouls.com/uploads/1/3/0/3/130323290/tagoterolagi_biredaweweva_lusasi.pdf
    • http://uniabuja-alumni.com/uploads/1/3/0/5/130589264/030df4294dbe3e.pdf
    • http://jaycostanzaart.com/uploads/1/3/0/7/130775792/01f2b65ef70.pdf
    • http://keizerparksfoundation.org/uploads/1/3/0/6/130622095/2727903.pdf
    • http://realpeopleseminars.com/uploads/1/3/0/3/130323675/84b8f4.pdf
    • http://1posc.org/uploads/1/3/0/6/130604218/dejog_raxevibata_kapero_dipexewovuzu.pdf
    • http://restaurant.nomadsadventurequest.com/uploads/1/3/0/2/130270982/guselugapukugiv-pujugazog-gepijifigewozo-josumibadiduri.pdf
    • http://simplyeasyhealth.net/uploads/1/3/0/6/130639477/1c7741.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b2b.bin
ca07338160de579cc5f570a23de8a7405c5d88f053e3ae9ad9c0190923b31624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2B 9936 bytes

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