Malicious PDF — malware analysis report

Static analysis result for SHA-256 584e8e1fc4026fea…

MALICIOUS

PDF

65.7 KB Created: 2020-04-21 20:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d66dcb7f9d5a487a3e0937965df218a0 SHA-1: a118e3cd3fd46d1e15e99955181341df06beedbb SHA-256: 584e8e1fc4026fea6e05b3f0b3ad9ad7dd983c55f027bfeb45a43600e2f8d4e6
94 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 domains with numeric slugs and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://fletchertavern.com/uploads/1/3/0/4/130478004/130478004.html#factoring+by+greatest+common+factor+answers
    • http://smooth-resolve.com/uploads/1/3/1/4/131437715/5485113.pdf
    • http://pawspharm.com/uploads/1/3/0/7/130776138/288024.pdf
    • http://missionsquarewhittier.com/uploads/1/3/0/6/130605076/5386eafb1682f4.pdf
    • http://scheridan.com/uploads/1/3/0/4/130435780/fusexu.pdf
    • http://makeemmiss.com/uploads/1/3/1/6/131636914/6849496.pdf
    • http://kreweclothing.com/uploads/1/3/1/3/131380087/kuvipumu-pavole-xefetokunuz.pdf
    • http://familyandbusinesslearning.com/uploads/1/3/1/4/131407588/wodakupimefazi-bazel-mirise-ditobu.pdf
    • http://robinthewriter.net/uploads/1/3/1/3/131384663/7e6146db06991.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_off0000bb9e.bin
538ffdd97086ebf3daa47cc23854a89c7af8518ca981c418f84d734eec5536c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9E 8088 bytes
font_01_sfnt_off0000db29.bin
3d52fc27d04b8b84b219df719738f768697e09c2050136bc1fe69fcddf4eca6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 2652 bytes
font_02_sfnt_off0000e48f.bin
b4eaba1313c2ae02e0840532e8df49817f4492e706e7fc7006fa435ca033da2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16208 bytes

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