Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4ee6313b5cbc7c…

MALICIOUS

PDF

128.4 KB Created: 2020-03-18 10:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4e159ed34d7c243c62d87f9b523fa66 SHA-1: ee0f4c5cd812c48e296c0fd262aa3e821ca341cc SHA-256: ef4ee6313b5cbc7cef0d303d89ec1263a27603383fad7719b9e7d27d671b26c9
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to numeric or book-title-based slugs on various domains, indicating a link farm for SEO manipulation. The document body, though partially corrupted, contains text suggesting it is a 'Libro de tecnologia 3 secundaria contestado' (answered technology book for 3rd secondary), which is likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly flagged this PDF as malicious.

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://speelkoning.net/uploads/1/3/0/2/130289719/130289719.html#libro+de+tecnologia+3+secundaria+contestado
    • http://daniel.elseisyelcuatro.com/uploads/1/3/0/8/130813325/4994b8a559.pdf
    • http://edencottage.us/uploads/1/3/0/5/130539049/14a720c.pdf
    • http://www.metropcsautoadverts.com/uploads/1/3/0/4/130488308/jogawuvidipugut.pdf
    • http://eventsbyerrika.com/uploads/1/3/0/6/130639551/ridal.pdf
    • http://cindylea.com/uploads/1/3/0/3/130313588/tuxugugop.pdf
    • http://moneymakerguidebook.com/uploads/1/3/0/7/130775274/xavenasupef.pdf
    • http://www.fashionandjesuspassion.com/uploads/1/3/0/5/130539035/wububenufezijumig.pdf
    • http://mx.wendellmillspiano.com/uploads/1/3/0/5/130543170/gerotabuzoza.pdf
    • http://www.gwensbooknook.com/uploads/1/3/0/2/130271094/bufuvozajobisa.pdf
    • http://belleandmac.com/uploads/1/3/0/6/130639045/tilipidu.pdf
    • http://nstarlight.com/uploads/1/3/0/5/130541313/gikiwobidusu-nelirud-pilipapupedeb-repopevij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aa89.bin
3edf450d0a90d788cc0867670070d80b2b14d561b3c9b4ac256fb38307564cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA89 9868 bytes
font_01_sfnt_off0001cdb2.bin
ec538195ac0dda115be2b5bcd0b7c0f0ac02727f0f790c5c9e173a2096324784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDB2 4260 bytes
font_02_sfnt_off0001dc5f.bin
3486118c2e8f7d07da9246b32decec7cf0dc6a99892be4e917e5d3b68e6e59b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC5F 16084 bytes

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