Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22b5a17be7e0398…

MALICIOUS

PDF

55.1 KB Created: 2020-04-17 20:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48f7d1a0e35b999613134835c92109b5 SHA-1: 6d313112cc6aa9b1bee1bde121c57be5d072f05e SHA-256: a22b5a17be7e0398a6eb524cc192affa9272987535d5c80a1608d314483db3d9
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on unrelated domains and use numeric slugs, indicating a link farm or SEO poisoning tactic. The document body, though truncated, contains the phrase 'Laboratory investigation answers', suggesting a lure to trick users into visiting these malicious links. No scripts were extracted, and the primary malicious activity appears to be the distribution of numerous external URLs.

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://forkandcook.com/uploads/1/3/0/4/130478174/130478174.html#laboratory+investigation+answers
    • http://utucapital.com/uploads/1/3/0/7/130740192/dbbeaaaaeae6.pdf
    • http://olsonimmigration.com/uploads/1/3/0/6/130621446/8466163.pdf
    • http://michaelmchalffey.com/uploads/1/3/1/1/131164024/nitotiw.pdf
    • http://darciesdelicacies.com/uploads/1/3/1/1/131164007/rikurufodamix.pdf
    • http://parisspaceshuttle.com/uploads/1/3/0/6/130604427/lotakudi.pdf
    • http://dubbelt.net/uploads/1/3/0/7/130775025/funifi.pdf
    • http://longstemdeepplanting.com/uploads/1/3/0/9/130969048/nufidit-kuvinewirafo-golaja.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_off0000a5fa.bin
154d2d409e5f3f4dbea617708bc730cc0aaee7a5c83ac890b818b7ec2a984f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5FA 1692 bytes
font_01_sfnt_off0000ae12.bin
0e29abb354203544b2c8442c72c997408a466a8ad3f5b72ee9ed13b15262dbc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 8552 bytes

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