Malicious PDF — malware analysis report

Static analysis result for SHA-256 066eafa9ccd3f231…

MALICIOUS

PDF

53.1 KB Created: 2020-04-12 00:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5945f8416f0d52cdd9ead0907cf148af SHA-1: 392f2e39a0cc11eb29de4c74bc4720bb34c21bf9 SHA-256: 066eafa9ccd3f2314000e7a877f987baf0e0fa22ad5c5d823dd707e4b2d2098c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to suspicious domains and appear to be part of a link farm. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that likely leads to a malicious site. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chengs.xyz/uploads/1/3/1/4/131408849/131408849.html#como+calcular+el+area+de+un+cuadrado+teniendo+la+diagonal
    • http://commqwest.net/uploads/1/3/1/4/131453171/7418693.pdf
    • http://xn--ou-e-6pa.com/uploads/1/3/0/8/130874308/97afcdb.pdf
    • http://lozera.cz/uploads/1/3/1/4/131483454/tajojapikujofu.pdf
    • http://bartonstrip.com/uploads/1/3/1/4/131438244/7383166.pdf
    • http://coactivefg.com/uploads/1/3/0/5/130589279/3924159.pdf
    • http://hscinfo.com/uploads/1/3/1/1/131164093/6910359.pdf
    • http://nfgcycles.com/uploads/1/3/1/1/131163635/zowuwirogiju.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000753c.bin
b9d2204129d38dd271068c9f02223a777ff2d7f4b1cbe1a2a843a8ba9fc66f36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 11744 bytes
font_01_sfnt_off00009c54.bin
e6247172e152b2beb611611cd8c41fc3c3fbe19307a0d04255cee9b1fa8ccfcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C54 6144 bytes
font_02_sfnt_off0000b030.bin
9a2e38ed526ea6c2202af5fd39b43008b19e81619e20bec9db0c0eecbd0c47e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16152 bytes

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