Malicious PDF — malware analysis report

Static analysis result for SHA-256 2178399cc1e8db07…

MALICIOUS

PDF

48.1 KB Created: 2020-04-11 01:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7c387d9cde31aef5fed45b905f212d84 SHA-1: b936cc4d04511b2a96310c9b9835da8c502411b4 SHA-256: 2178399cc1e8db07ad1265b27f840737045cc5ec6171716a70cf2242c83b7da0
62 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains references to 'Yiruma maybe piano sheet music' and the PDF creation tool 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The primary heuristic 'PDF_SEO_LINK_FARM' confirms the mass linking to external domains, likely to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

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://adsl-63-204-18-60.benefitplans.org/uploads/1/3/1/4/131407083/131407083.html#yiruma+maybe+piano+sheet+music
    • http://alleghenyknifeworks.com/uploads/1/3/0/3/130324324/38140194e03b.pdf
    • http://artemdeev.pro/uploads/1/3/0/7/130738484/xomipem_leniredobigo.pdf
    • http://swisskonig.net/uploads/1/3/0/6/130620729/2c409fcbadb.pdf
    • http://graniteandmarbleservice.com/uploads/1/3/0/6/130639709/raromigomewapazat.pdf
    • http://samloney.com/uploads/1/3/0/2/130289479/86a2d77c7.pdf
    • http://mta-sts.mail.julielynnmortensen.com/uploads/1/3/0/7/130739949/740361.pdf
    • http://autistech.org/uploads/1/3/1/4/131437487/zutexadelu-xeviduvujil.pdf
    • http://myunit3.com/uploads/1/3/0/9/130969842/72cfac51fd.pdf
    • http://cafealbala.com/uploads/1/3/0/3/130323929/1182817.pdf
    • http://simetalfinishing.com/uploads/1/3/0/8/130874478/jovedunuloxaju_zazalipi_rikuvitopawo.pdf
    • http://lifewithoxygen.com/uploads/1/3/0/7/130775144/regawevok.pdf
    • http://spiritedquest-equine.com/uploads/1/3/0/6/130620982/gonurapiwunuted.pdf
    • http://jdlairdauthor.com/uploads/1/3/0/6/130621472/eec6b3b09f16a55.pdf
    • http://orpingtonaustralia.com/uploads/1/3/1/4/131410311/wopujelilasikos.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_off00009232.bin
30987173f65b17a7d0e6e1a502ea919869e25947704aae686c20fad8775e0da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9232 9380 bytes

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