Malicious PDF — malware analysis report

Static analysis result for SHA-256 4876282f455a3bbb…

MALICIOUS

PDF

34.6 KB Created: 2020-06-08 13:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a105cfadd6b1ef34c1119a7659129ad1 SHA-1: adc44d8cf6e9a111858a214a5cff061108f552aa SHA-256: 4876282f455a3bbbb542147b9d35e0a79794d5cd3ea1aa37f1643f77f3d46c9a
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic specifically identifies this behavior, pointing to a network of domains. While no scripts were extracted, the sheer volume and nature of the embedded links strongly suggest a malicious intent to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://clouttrain.net/uploads/1/3/0/7/130775897/130775897.html#planet+earth+freshwater+worksheet+quizlet
    • http://legendsinmusicpedia.com/uploads/1/3/0/8/130814353/60102.pdf
    • http://purplelotusschool.com/uploads/1/3/0/7/130740465/kutuneta-jonozo.pdf
    • http://tjrothconstruction.com/uploads/1/3/1/8/131860204/zaliberixopebiv.pdf
    • http://matthewkcompton.com/uploads/1/3/0/2/130271076/2653207.pdf
    • http://tieredwifi.com/uploads/1/3/0/9/130969709/a85e04a59e1c7b9.pdf
    • http://perfectoitaly.com/uploads/1/3/0/7/130739169/finisuvokowopotodu.pdf
    • http://server1.skumagic.com/uploads/1/3/0/2/130270799/buzozesegojamipubij.pdf
    • https://fuzejumif.files.wordpress.com/2020/06/30393698048.pdf
    • https://fevogazu.files.wordpress.com/2020/06/vuzude.pdf
    • https://zodamutove.files.wordpress.com/2020/06/24258127201.pdf
    • https://lexepupufuke.files.wordpress.com/2020/06/kazeri.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_off00005b0b.bin
a37d32cc731b8138b1a3e6ad05bc49579181ab923e3d0af7a370dfedf7b7e018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0B 10140 bytes

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