Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4be7af0a3357f22…

MALICIOUS

PDF

38.7 KB Created: 2020-03-08 10:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af1cb094bf468ab8c7a469989682e37d SHA-1: 62296e8821161f4def7b7966706d74380d89e5a7 SHA-256: c4be7af0a3357f2293e4951a359e1759c8000c99c4ddde1c3fb275ba8643b462
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the link farm attack pattern. No scripts were extracted from this sample.

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://host95.carmichaelnl.com/uploads/1/3/0/4/130490115/130490115.html#acute+kidney+injury+nejm+review
    • http://findapig.com/uploads/1/3/0/7/130739883/fokugudamovi-ziwurosoj-pugalabir-jipuxedaw.pdf
    • http://www.characterwithcharles.com/uploads/1/3/0/5/130590108/juweravokogaja.pdf
    • http://hivedeep.com/uploads/1/3/0/7/130740368/beneralenip-votoke-xoparaneroluwi.pdf
    • http://hostmaster.eastsideyoga.co.uk/uploads/1/3/0/4/130476513/1312719.pdf
    • http://www.proteamworksdev.com/uploads/1/3/0/7/130739120/9425571.pdf
    • http://positivepaths.info/uploads/1/3/0/8/130873712/3475615.pdf
    • http://webdisk.lapakumroh.com/uploads/1/3/0/5/130588635/gotofulagasadupeg.pdf
    • http://www.shaynachair.com/uploads/1/3/0/7/130776727/medumelebe.pdf
    • http://zagreb-experience-tours.com/uploads/1/3/0/5/130543166/09419633ff48c7.pdf
    • http://steven-trotter.com/uploads/1/3/0/4/130494289/tazezafunosilok_debusifukisis_pupelumaze_ranesujovigolut.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_off00006d90.bin
b48eaa1a40821d8b29024bdc685877ca18e0983fd429756c0bd9c88f9e675e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D90 8920 bytes

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