Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ac9102eebbea95…

MALICIOUS

PDF

48.4 KB Created: 2020-03-10 10:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb5a7084c90c9226c7791b07265eb7ca SHA-1: 5a6b73fa1da0c4f4fcfee52e2011f341bbcdf2f4 SHA-256: d3ac9102eebbea95aa9c77d8b15c3f8fa6ee295fe55fa515bce1b57af2d83ad3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a link farm, with a significant number of external URLs embedded within its content. The primary heuristic, PDF_SEO_LINK_FARM, indicates a mass of external links, suggesting a potential SEO spam campaign or a distribution point for further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://x0847515xstreamtravel.xsideas.com/uploads/1/3/0/6/130604902/130604902.html#farm+animals+craft+for+kindergarten
    • http://mysteriesnghostsefiction.com/uploads/1/3/0/5/130539728/4625fbe4f727.pdf
    • http://porktexas.com/uploads/1/3/0/2/130271049/jamelekelol.pdf
    • http://mx.anauthorslife.blog/uploads/1/3/0/7/130740151/7599806.pdf
    • http://dickquick.com/uploads/1/3/0/5/130589427/e9611c23bdd94.pdf
    • http://mathcollective.com/uploads/1/3/0/4/130436154/2839738.pdf
    • http://needavac.com/uploads/1/3/0/4/130436222/9993886.pdf
    • http://whateverwelding.com/uploads/1/3/0/5/130551362/d2904675b9d.pdf
    • http://maryparker.net/uploads/1/3/0/6/130620991/62f30cc4c.pdf
    • http://justforjeeps.net/uploads/1/3/0/6/130639121/5636170.pdf
    • http://store.smilesonwings.org/uploads/1/3/0/6/130620449/0917289f61dab.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_off00006928.bin
8bf77912758159d81472ddaf9a5c46488b3341d362b0f0ae4c3f4b698e8488f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 7824 bytes
font_01_sfnt_off0000877d.bin
03f25d6ab2aa11ff86e7d4508fd707d4d3c71c530bddb1094222d299e6ac7c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877D 8556 bytes
font_02_sfnt_off00009f4b.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4B 16036 bytes

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