Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44f6ca829a8fba7…

MALICIOUS

PDF

39.8 KB Created: 2020-03-28 06:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: be1d3eee8bc2167856a537900cfb36ee SHA-1: 936b75ae3c41684deb4bfeaa8be5ae231e9b2571 SHA-256: b44f6ca829a8fba73c5c4ebda5e3f507fcd1ec649eb126678d6ed2914aa073a4
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to a URL that is also listed among the extracted IOCs. This suggests a link-farming or redirection scheme, likely intended to lead users to malicious websites or to manipulate search engine rankings.

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://spectrumherniaclinic.com/uploads/1/3/0/4/130475925/130475925.html#resumen+corto+del+principito+capitulo+17
    • http://namastae.ca/uploads/1/3/0/4/130435600/mixexepe.pdf
    • http://www.ljmgraphicdesigns.com/uploads/1/3/0/7/130740504/479330.pdf
    • http://olmanlandscaping.com/uploads/1/3/0/7/130776659/125c054dc8.pdf
    • http://thelonghornsd.com/uploads/1/3/0/5/130588435/9979694.pdf
    • http://aqua2s.fr/uploads/1/3/0/5/130590456/mewemirejoluz.pdf
    • http://spencerbarnor.com/uploads/1/3/0/4/130489958/pozife-pebemapegetare-nitokut.pdf
    • http://bookkeepingfornonprofits.com/uploads/1/3/0/6/130603939/vezagufafojaxujap.pdf
    • http://lilfaith.net/uploads/1/3/0/5/130540077/76306ba6e5fe4.pdf
    • http://speechsounds.xyz/uploads/1/3/0/6/130605374/6159751.pdf
    • http://admin.kingscounselling.co.uk/uploads/1/3/0/5/130545097/kuwikezi.pdf
    • http://www.viantrucking.com/uploads/1/3/0/5/130539774/aeecd2d7807.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_off00007340.bin
d34a1ed42f206b7a1410be2c51a6beaf4f5b6a98823a9033b2d5190356a4bda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7340 8656 bytes

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