Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81121a854487ac6…

MALICIOUS

PDF

51.9 KB Created: 2020-03-20 02:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bdc678fe8ee209d4f3f2971fb354ccba SHA-1: f1c86769fbf44b81946b7b4c514dce9ce12f890c SHA-256: b81121a854487ac6d95d9dd6b1d0d6f82adbf1029e2985b94c71e5f9a7a308e0
92 Risk Score

Malware Insights

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

This PDF document contains a large number of external links to other PDFs hosted on various domains, indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of seemingly unrelated PDF documents, likely to manipulate search engine rankings or distribute malicious content indirectly. No scripts were extracted, and the document body was heavily obfuscated, but the heuristic firings clearly point to a link-based distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://nursingarmpillow.com/uploads/1/3/0/8/130814575/130814575.html#thin+layer+chromatography+lab+report
    • http://integratedvaluation.org/uploads/1/3/0/4/130490410/wonokupomef.pdf
    • http://raeandchloe.com/uploads/1/3/0/2/130271185/mexozufesujujun.pdf
    • http://forestranchca.org/uploads/1/3/0/5/130590154/wanajoved.pdf
    • http://www.harcywraps.com/uploads/1/3/0/9/130969509/tudagaguzo-ritipa-fijunoveko-gipexefilug.pdf
    • http://aaronmmoore.com/uploads/1/3/0/4/130435947/zinaza.pdf
    • http://abbydyer.com/uploads/1/3/0/4/130483134/telulatokugaz-dubanebu-rorazeb-vifodewofepigi.pdf
    • http://www.autisminfo.nl/uploads/1/3/0/9/130969012/3cce8.pdf
    • http://nwavalanchesolutions.com/uploads/1/3/0/5/130589241/09f81.pdf
    • http://architecturallandmarksus.com/uploads/1/3/0/2/130289421/demanemufigide.pdf
    • http://vitainsilica.pl/uploads/1/3/1/0/131069808/tefolut_kibezigidu_xisax.pdf
    • http://www.gorgeflowyoga.com/uploads/1/3/0/4/130483578/4d3078.pdf
    • http://jackihankin.com/uploads/1/3/0/5/130539517/gopinajiserilakosowi.pdf
    • http://besticecream.org/uploads/1/3/0/5/130589412/1595310.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_off00008c63.bin
a5ed12bd88e9dfc8d3f6544f5c18a9799cfe5d92a16f693115166724d24a9161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C63 8636 bytes
font_01_sfnt_off0000ad75.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD75 16036 bytes

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