Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92cda442430965b…

MALICIOUS

PDF

46.8 KB Created: 2020-03-23 02:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3086678d3f620de1321e1f2b34ad5211 SHA-1: aae1ff954e5c4d6bd8e774fa756ac4d31b8842f7 SHA-256: a92cda442430965b60afe5974141fd15f413c06ad981be5bf4c8334ebc7b2d87
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body text is largely unreadable, but the presence of a link farm is a strong indicator of malicious intent.

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://cchristensenphoto.com/uploads/1/3/0/5/130588556/130588556.html#what+is+ethics+in+verbal+communication
    • http://mx.loripreciousdirector.com/uploads/1/3/0/6/130603688/fobaderoji.pdf
    • http://secondaire1et2.net/uploads/1/3/0/2/130270993/tudumofegapajifa.pdf
    • http://stevessongs.com/uploads/1/3/0/6/130639839/bigexekeredebamukopa.pdf
    • http://imgmfr.com/uploads/1/3/0/6/130621634/826832.pdf
    • http://comstar-global.com/uploads/1/3/0/6/130640040/sarosufoxuvulexane.pdf
    • http://breakthroughchurchdallas.org/uploads/1/3/0/4/130436482/josewiruka-zinezenu-doweb.pdf
    • http://sginvestmentproperties.com/uploads/1/3/0/7/130776316/1646281.pdf
    • http://alloutmfg.com/uploads/1/3/0/6/130620217/8820b5bd8f4.pdf
    • http://creativesmut.com/uploads/1/3/0/3/130313588/zavav.pdf
    • http://pxbible.net/uploads/1/3/0/3/130379133/2187422.pdf
    • http://mywriteadvice.com/uploads/1/3/0/5/130551239/rofupadumebajinejito.pdf
    • http://keyaquasports.com/uploads/1/3/0/7/130776599/2234329.pdf
    • http://ryanbokehphotography.com/uploads/1/3/0/5/130551864/tukitutijulapuvoda.pdf
    • http://www.coachmaria.us/uploads/1/3/0/9/130969714/7341929.pdf
    • http://nickandgraceguy.com/uploads/1/3/0/4/130490399/kafinezuwogi.pdf
    • http://repwavets.org/uploads/1/3/0/6/130621523/4686652.pdf
    • http://www.1ofnoneworldwide.com/uploads/1/3/0/8/130874086/manelaju.pdf
    • http://studtitecp.com/uploads/1/3/0/5/130551164/rivawawu.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_off00007a17.bin
2e03bc4e13565b3d773911dabe576a18efd2f8dac0990d7f560ebb27946106c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A17 8220 bytes
font_01_sfnt_off00009891.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9891 16036 bytes

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