Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb9263213831846…

MALICIOUS

PDF

51.4 KB Created: 2020-04-12 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3db9cd5297c6eb2212ca8c277efc754 SHA-1: 3d7dd8ec7e9bb92c631331e5eb2cc99bd0b82bd5 SHA-256: cfb92632138318466bc65006f2bcddcc9143f194ef4c043955456d47f2d19f6f
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 pointing to similarly structured URLs on different domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text and metadata, but the primary malicious activity appears to be the distribution of links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://abacusdispatch.net/uploads/1/3/0/6/130603834/130603834.html#oxido+de+telurio+vi+formula
    • http://partuschfire.org/uploads/1/3/0/8/130814586/7643823.pdf
    • http://nadiageiger.com/uploads/1/3/1/4/131437359/8387160.pdf
    • http://marlborotire.info/uploads/1/3/1/4/131454106/vapamogotugogiru.pdf
    • http://mike-manning.com/uploads/1/3/1/4/131438478/ebab0865a08d49.pdf
    • http://foreverplay.org/uploads/1/3/1/0/131070846/xeligorefesuzalik.pdf
    • http://youngbabuu.com/uploads/1/3/1/4/131437107/6670551.pdf
    • http://maxheadquarters.com/uploads/1/3/0/6/130604020/robozan.pdf
    • http://lyssaslovablejewels.com/uploads/1/3/1/4/131437756/tamusofo_xezezi_lojotebolafob_fibaxepo.pdf
    • http://abiahthrift.com/uploads/1/3/1/3/131398509/rujemamukexofisedori.pdf
    • http://westbranch.us/uploads/1/3/0/5/130589429/kubuxipukezegerepor.pdf
    • http://ohshootmagazine.com/uploads/1/3/0/5/130551668/3bf1294cf1.pdf
    • http://thecrossinglive.net/uploads/1/3/1/0/131071019/9840590.pdf
    • http://makeupbykatherine.net/uploads/1/3/0/2/130289746/e43b3e96a6.pdf
    • http://southernshipshaper.com/uploads/1/3/0/7/130775271/dozufosu_sorabifef_tobizetonegolez.pdf
    • http://westbran
    • 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_off0000781d.bin
89427d6aafe98da2048f2d532b60b061bf21e3c89dd983dcefb8be5788a20285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781D 11044 bytes
font_01_sfnt_off00009e57.bin
246eae442c10f0dd3abfae90709823bdb2063cab793a7d3ea9ae69d38dbdcbbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E57 3388 bytes
font_02_sfnt_off0000aa26.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA26 16036 bytes

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