Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cafdc867c5fb247…

MALICIOUS

PDF

35.3 KB Created: 2020-06-13 18:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40d1c98a8bcf152f8d7a4ceaa180d2a7 SHA-1: 9310223d5c37302ae067cbf10b92234bb223213e SHA-256: 4cafdc867c5fb247f8e190b1a54974dae6b9bf2881fb7d10807531da958f1ed7
62 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of numerous external links, a technique commonly used in link farm attacks. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a high volume of links pointing to external domains. The document body, though heavily obfuscated, contains references to these URLs, suggesting they are the primary mechanism for delivering the malicious payload or luring victims. No scripts were extracted, and the document body did not provide further context on the specific lure.

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://strengthsgrid.com/uploads/1/3/0/4/130491322/130491322.html#est%25C3%25A1tica+mec%25C3%25A2nica+para+engenharia+do
    • http://mail.beulahbaptist.com/uploads/1/3/1/1/131164066/zezinorizif.pdf
    • http://bulkingbarbie.com/uploads/1/3/0/5/130589281/rekoluvelikaforivabo.pdf
    • http://justinayostphotography.com/uploads/1/3/0/5/130545827/6904664.pdf
    • https://tobodinu.files.wordpress.com/2020/06/kujanobevozibepa.pdf
    • https://samudazekami.files.wordpress.com/2020/06/momunanu.pdf
    • https://zajenunu.files.wordpress.com/2020/06/17042663467.pdf
    • https://zivuwisi.files.wordpress.com/2020/06/xazukobukafopajave.pdf
    • https://raxoxatubu.files.wordpress.com/2020/06/depisemipokivuwomatarobiw.pdf
    • https://feraponopegi.files.wordpress.com/2020/06/fuzito.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_off00005858.bin
884b378e8c1bd2b6a12304bac5678301a2eb3c5b5b938cb15740a13afbfc2e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5858 13232 bytes

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