Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb1627efa956121…

MALICIOUS

PDF

44.9 KB Created: 2020-04-21 00:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bee4d24dff810ac5fea0d7ce93eb1b85 SHA-1: 3f7d633aaa772786ec8a501d0fda2756caeea741 SHA-256: 8bb1627efa95612168ccb820304661cec2e471f0758620866e06c24e26613548
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, many of which are hosted on domains that appear to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains references to 'Android one update nokia 6', suggesting a lure to trick users into clicking these malicious links. The ML classifier strongly indicated maliciousness, and the presence of a link farm points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://marikacleaningservice.com/uploads/1/3/0/2/130271145/130271145.html#android+one+update+nokia+6
    • http://ingermargothann.com/uploads/1/3/1/3/131381151/temakidibu.pdf
    • http://kremerfamily.net/uploads/1/3/1/4/131438329/95e08.pdf
    • http://richmenentertainment.com/uploads/1/3/0/7/130776246/3905428.pdf
    • http://stacylin.com/uploads/1/3/1/4/131482995/551712.pdf
    • http://franksheatingandair.net/uploads/1/3/0/8/130815013/44c78ef77f785.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_off00007b1e.bin
a9e024bf9092f4c907e9ca7016c5cd0801f1db6b6ab4e1ba259d644606684059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 9188 bytes
font_01_sfnt_off00009e21.bin
f89c0e0946aa0d1e48aa5356a2d31bc24f5b96ca1f2cb84330b25817f6444d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E21 2024 bytes

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